Used Parts Interchange & Fitment: How One Part Fits Many Cars
Automakers reuse the same parts across different models and model years to save money on manufacturing. That works in your favor at a junkyard: the alternator you need may sit on four other vehicles you never thought to check. Knowing how parts interchange, and how to confirm fitment with a Hollander number, turns one donor car into a dozen and keeps you from buying the wrong part.
What "interchange" actually means
Interchange means a part from one vehicle bolts in and works on another without modification. It is not a guess. Recyclers track it with the Hollander Interchange, the industry database that assigns a number to every group of confirmed-compatible parts.
When two cars share the same Hollander number for a part, that part is confirmed to fit both. Give a yard clerk the number and they can search their whole lot for a match instead of hunting by car.
How platform sharing widens your options
Most parts are shared within a "platform," the common engineering base a manufacturer builds several models on. A 2009 Honda Accord 2.4L shares its alternator with the Acura TSX, the CR-V, and the Element of the same era because they all run the K24 engine family. Learn the platform and your donor pool grows from one car to several.
Common platforms that share major parts
These families share many drivetrain, suspension, and electrical parts. Always confirm the specific part with a casting or Hollander number, but start your search across the whole group.
| Platform / engine | Vehicles that often share parts |
|---|---|
| GM LS V8 | Camaro, Corvette, Silverado, GTO, CTS-V, Trailblazer SS |
| Honda K24 | Accord '03–'12, CR-V '02–'11, TSX '04–'08, Element '03–'11 |
| Toyota 2GR-FE V6 | Camry, Highlander, Sienna, Venza, RAV4 V6 |
| Ford Coyote 5.0 | Mustang GT '11+, F-150 '11+ (different oil pan/accessories) |
| Chrysler 5.7 HEMI | Ram 1500, Charger, Challenger, Durango, Grand Cherokee |
| Subaru EJ25 | Impreza, Legacy, Outback, Forester '96–'12 |
| Nissan VQ35 | 350Z, Altima V6, Maxima, Murano, Pathfinder, Quest |
| VW/Audi MQB | Golf, Jetta, Tiguan, Audi A3/Q3 |
Hollander interchange examples
A Hollander number identifies a group of interchangeable parts. Find yours on Car-Part.com, in eBay Motors listings from reputable sellers, or by asking the yard clerk, then verify the sub-variants in the notes column.
| Part | Example Hollander # | Verify before buying |
|---|---|---|
| Headlight assembly | 1590-04R | Driver vs passenger side specific |
| Engine long block | 610-00890 | VIN 8th digit (engine code) must match |
| Automatic transmission | 746-01234 | Gear count, 2WD vs 4WD output |
| Door shell | 2800-XXXX | Mirror location, window/lock type (color irrelevant) |
| Wheel / rim | 8041-XXXX | Bolt pattern, offset, center bore |
| Axle shaft | 3890-XXXX | Spline count, ABS reluctor ring |
Confirm fitment before you pull (or pay)
Interchange gets you close. These six checks confirm the exact part before you spend money or remove a bolt.
- check_circleCasting or forging numbers stamped in the metal match your original.
- check_circleBolt pattern and mounting points line up exactly.
- check_circleElectrical connectors match pin count and lock-tab orientation.
- check_circleFor engine-specific parts, the VIN 8th digit (engine code) matches.
- check_circleOption codes (RPO on GM, the door-jamb sticker) confirm features like a tow package or limited-slip diff.
- check_circleCross-reference the part number on Car-Part.com, RockAuto, or the OEM catalog.
Frequently asked questions
What is a Hollander interchange number?expand_more
The Hollander Interchange is the salvage industry's standard database. It assigns one number to each group of confirmed-compatible parts, so any parts sharing that number fit the same vehicles. Yards use it to search inventory across locations.
Where do I find the Hollander number for my part?expand_more
Check Car-Part.com (it shows interchange and donor vehicles), reputable eBay Motors listings, parts cross-reference tools at RockAuto or O'Reilly, or simply ask the yard clerk to look it up at their terminal.
Will a part from a different make ever fit my car?expand_more
Yes, when both vehicles share a platform or supplier. Pontiac Vibe and Toyota Matrix share most parts; many Mazda and Ford parts interchange from shared platforms. Always confirm with the casting or Hollander number rather than assuming.
What should I always verify on engines and transmissions?expand_more
Match the 8th VIN digit (engine code) for engines, and confirm gear count plus 2WD/4WD output on transmissions. Demand the donor vehicle's full VIN so you can check mileage and title status before buying.
Find the part and the yard
Search used parts by year, make, and model, or browse 20,000+ self-service salvage yards near you to pull the interchange part yourself.