19 Products
AC Car Parts
AC parts identification begins with the individual car, not the Cobra outline or the model name on a registration document. The marque spans early sports cars such as the Ace and Aceca, Cobra generations, the 428 and mid-engined 3000ME, later Mk IV and CRS derivatives, limited continuation-style builds and modern GT or Ace programmes. Similar body shapes can conceal different chassis construction, engines, gearboxes, axles, brakes and electrical systems. Replica and independently built Cobra-style cars also require their own manufacturer data; appearance must never be used to describe one as an AC.
Record the chassis or VIN exactly, manufacturer plate, registration, build date, body number where present and any factory or specialist build record. Photograph the installed component before removal, including casting, stamping, connector, flange and fastener details. A registration lookup can suggest a model and year but cannot prove a later engine swap, brake conversion or axle ratio. On a low-volume car, a running production change or customer option may be more important than a broad model-year boundary.
Verify engine family and number, carburettor or injection system, gearbox type, bellhousing, propeller-shaft joints, differential, wheel hub and brake package separately. Do the same for steering rack, suspension joints, dampers and cooling hardware. Never select fluid by marque alone: engine-oil approval and viscosity, coolant chemistry, gearbox lubricant, limited-slip differential oil and brake fluid must follow the installed system and its service record. Mixing an unsuitable oil can affect synchro operation, seals or differential friction.
Inspect tubular chassis rails, outriggers, bonded or riveted structures, aluminium or composite panels, fuel hoses, brake lines, exhaust clearance and restraint mountings before cosmetic work. Side pipes and exposed exhausts can cause severe burns. Centre-lock wheels, where fitted, need the correct thread direction, seating and tightening procedure. Modified, historic and individually approved vehicles can have different MOT, emissions and construction requirements, so use current UK rules and the car's documentary identity. For safety-critical work, build evidence and measured component data take priority over assumption.
Your Current Vehicle
Or
Select Your Vehicle
Shop Parts by Category
Choose a category to view parts for your selected vehicle.
AC Car Part Categories
Only categories with verified fitment products are shown.
Build an identity file for the individual AC
AC identity cannot be reduced to one visual family. Historic Ace and Aceca models, Cobra iterations, the 428, 3000ME, later Mk IV and composite-bodied derivatives, continuation programmes and current clean-sheet cars use markedly different engineering. Bespoke orders and low production volumes introduce further variation. A Cobra-shaped car may instead be an independently manufactured replica with its own chassis, approval and parts sources.
Start by transcribing the chassis or VIN from the vehicle, not a previous invoice. Record manufacturer plate, registration, first-registration and build evidence, body number where applicable and the name on the V5C. Treat discrepancies as a reason to investigate. A V5C describes registration status; it does not certify that every installed component remains as built.
| Identity evidence | What it can establish | What it cannot prove alone |
|---|---|---|
| Chassis or VIN marking | Core vehicle identity when genuine and correctly interpreted | Current engine, axle, brakes or later modifications |
| Manufacturer or build plate | Original build references, weights or specification fields | That a loose or reproduced plate belongs to the chassis |
| Registration document | Registered identity, status and recorded particulars | Factory authenticity or exact service-part specification |
| Build sheet, invoice or factory correspondence | Options and component specification at a documented date | Changes made after that record |
| Component casting and serial numbers | Installed engine, gearbox, axle or brake family | Originality without a chain back to build records |
| Physical measurement | Bore, thread, flange, offset and dimensions needed for matching | Material grade, internal ratio or approval status |
Separate the model family from the build specification
Model names help narrow the search but do not complete it. An early Ace can differ by engine installation and running gear. Cobra generations altered chassis, suspension, hubs and powertrain, and later AC-built versions need not share the service parts of 1960s cars. The 428 and 3000ME represent different front-engine and mid-engine architectures. Current GT and recreated Ace programmes are modern vehicles, not parts continuations of their visual ancestors.
Document body material and chassis form. Aluminium panels over tubular structure, steel bodywork, glass-reinforced plastic, carbon composite and modern extrusions each demand different repair techniques and isolation from dissimilar metals. Doors, screens, lamps and latches can be hand-fitted. Measure apertures and retain old shims rather than assuming another same-model panel will bolt straight on.
Continuation, restoration and replica boundaries
A continuation-style or later authorised build should be identified by its own chassis and manufacturer record. A restored historic car may retain identity while carrying replacement running gear. A replica is supported by its actual manufacturer and donor components. Never select parts or describe provenance from badges, bonnet shape or side pipes.
Major chassis, monocoque, engine or axle changes can affect registration and approval status. Before structural modification, check DVLA, DVSA and specialist engineering requirements applicable to that vehicle. Documentation should be preserved with the car.
| AC family example | Identity focus | Common assumption to reject |
|---|---|---|
| Ace or Aceca-era car | Engine installation, chassis number, brakes, hubs and body build | Every car of the name uses the same powertrain |
| Cobra-era or later Cobra derivative | Chassis generation, manufacturer, engine, gearbox, axle and suspension | Body appearance identifies bore, thread or brake package |
| AC 428 | Body/chassis record and installed driveline | Cobra-related ancestry makes service parts interchangeable |
| AC 3000ME | Mid-engine layout, gearbox and production specification | A generic AC engine catalogue applies |
| Mk IV, CRS or other low-volume derivative | Exact build material, engine and option record | Later designation equals an earlier Cobra mechanically |
| Modern GT or Ace programme | Modern VIN, build data, diagnostics and safety systems | Classic-shaped panels imply classic servicing |
Identify engine, gearbox and final drive independently
Clean the identification area without removing stamp detail. Record engine number, casting family, induction, ignition, sump, filter interface and accessory layout. Historic cars may have period replacements or upgraded cooling. Later cars can use electronically managed engines requiring exact sensor, calibration and emissions hardware. A capacity written on a badge is insufficient for gaskets, filters or ignition parts.
For the gearbox, record casing, selector position, number of ratios, bellhousing, clutch actuation, input and output flange. Do not infer lubricant from whether the box is manual. Some gearboxes require a specific oil for synchroniser friction; others use automatic-transmission-type fluid. Differential identification needs casing, ratio tag, flange, shaft type and confirmation of any limited-slip mechanism.
Propeller shafts and universal joints
Measure flange pattern, joint dimensions, tube clearance and sliding movement before ordering. Mark shaft phasing before disassembly. A vibration can originate in joint wear, balance, operating angle, engine mounts or axle alignment; replacing one joint without checking geometry may leave the fault and create safety risk.
Brakes, steering, hubs and wheels
Record caliper manufacturer and casting, piston arrangement, disc diameter, thickness, offset and whether the rotor is one- or two-piece. Verify master cylinders, servo, balance bar, rear handbrake mechanism and flexible-hose ends. Modified cars may combine components from several sources. Brake pad outline alone does not confirm compound suitability or road approval.
| System | Evidence to capture | Safety check |
|---|---|---|
| Brake disc and caliper | Diameter, thickness, offset, casting and piston layout | Clearance, hose routing, wear and matched axle specification |
| Master cylinder or pedal box | Bore, pushrod, reservoir and balance arrangement | No leakage, binding or unauthorised bias change |
| Steering | Rack or box, arm tapers, column joints and mounts | Free play, interference and secure collapsible features where fitted |
| Wheel hub | Bearing, stud or centre-lock type, handed thread and seating | Correct tightening method and no cracked or fretted seat |
| Suspension joint | Taper, thread, articulation range and bracket spacing | No preload, contact or loss of locking device |
| Damper and spring | Open/closed length, rate, bush width and adjustment | Matched axle setup, travel and tyre clearance |
Centre-lock systems require special attention. Establish thread direction, wheel seating, drive-peg condition, retaining hardware and tightening procedure from the build data. Do not copy a torque or hammering method from another Cobra-style vehicle. With conventional studs, confirm thread and seat type; lubricant changes clamp load and should be used only where specified.
Choose fluids by installed assembly and approval
There is no universal AC engine oil, coolant or driveline lubricant. Use the engine builder's viscosity and performance approval, considering bearing clearances, filtration and operating temperature. Coolant chemistry must suit engine, radiator and mixed metals. Do not mix colours as a proxy for chemistry. Record what is drained and flush only by a compatible procedure.
Gearbox and axle oils require the exact transmission specification. Limited-slip units may need a defined friction package. Brake fluid type follows seals, master cylinders and service data; silicone and glycol-based fluids must not be interchanged casually. Fuel hoses must suit modern fuel and pressure. A classic-looking braided hose can conceal perished rubber.
| Service fluid | Selection source | Risk of assumption |
|---|---|---|
| Engine oil | Installed engine/builder data and operating use | Wrong viscosity, additive level or filter compatibility |
| Coolant | Engine, radiator and material-compatible approval | Corrosion, gel formation or inadequate freeze protection |
| Manual gearbox oil | Exact gearbox specification | Synchroniser damage or poor shifting |
| Differential oil | Axle identity and limited-slip type | Chatter, wear or incorrect friction behaviour |
| Brake fluid | Hydraulic system and component instructions | Seal incompatibility, water control or mixed-fluid failure |
| Fuel | Engine calibration, hoses and tank system | Detonation, material attack or vapour problems |
Inspection, maintenance and UK roadworthiness
Inspect tubular chassis around suspension pickups, outriggers and body mounts. Look for corrosion beneath powder coat, cracked welds and crushed tubes from poor lifting. Aluminium over steel needs isolation and careful corrosion assessment. Composite damage can extend beyond a visible crack. Use the correct lift points and never work beneath a jack-supported car.
Check fuel and brake lines, side-exhaust security and heat shielding, throttle return, cooling hoses, battery retention, lighting, tyres and restraints. Side pipes remain hot after shutdown and can burn occupants and bystanders. Harnesses, if fitted, need compatible seats, anchorages and road use; a harness is not automatically a substitute for required seat belts.
MOT application, emissions assessment and lighting requirements depend on registered identity, age, class and modifications. Historic status does not excuse continuous roadworthiness. An extensively modified or newly built replica may need approval beyond an ordinary MOT. Resolve identity and construction questions before presenting or using the car.
AC parts and service FAQs
Q: Can an AC part be selected from the registration alone?
A: No. Confirm chassis identity and the installed component, because low-volume changes and conversions are common.
Q: Is every Cobra-shaped car an AC Cobra?
A: No. Identify the actual manufacturer, chassis and approval record without relying on appearance or badges.
Q: Do classic and modern AC Ace models share service parts?
A: Do not assume so. Modern programmes use their own construction, powertrain and build data.
Q: What evidence is most useful for a low-volume build?
A: Chassis marking, build record, component numbers, photographs and measured interfaces together provide the strongest basis.
Q: Can engine capacity identify the oil filter?
A: No. Record the exact engine and filter interface, including any remote housing.
Q: Is one gearbox oil suitable for every manual AC?
A: No. The installed gearbox determines lubricant approval and synchroniser compatibility.
Q: How is a limited-slip axle identified?
A: Use axle records, tags and internal or functional confirmation; do not infer it from model reputation.
Q: Are centre-lock wheel threads always the same direction?
A: No. Establish handed threads and the exact tightening procedure for that hub system.
Q: Can a replica use an AC parts catalogue?
A: Only where measured installed components genuinely match; the replica maker and donor data come first.
Q: Should coolant be selected by colour?
A: No. Use chemistry and approval compatible with the engine, radiator and existing system.
Q: What makes side exhausts a service hazard?
A: They remain hot, sit close to occupants and need secure mounts, shielding and adequate body clearance.
Q: Does an MOT exemption mean maintenance is optional?
A: No. Any applicable historic exemption does not remove the duty to keep the vehicle roadworthy.
Q: When should specialist AC or historic-vehicle advice be used?
A: Use it for uncertain identity, structural work, undocumented modifications and safety-critical component matching.
