eBay alerts for car and truck parts, by part number and fit

Get the part number first

A part number is the most reliable search there is: it means the same part whatever the seller calls it. Find yours here:

• On the old part. Alternators, sensors, modules, lights and many trim pieces have the number molded in or on a sticker.
• From a dealer parts counter. Give them your VIN and they can look up the exact number for your vehicle.
• In an online OEM parts catalog. Dealer parts websites show exploded diagrams with a number for every piece.

Formats vary by maker. GM numbers are usually all digits. Ford numbers have three parts: the middle one names the kind of part, and the prefix and suffix identify the vehicle and revision. Toyota and Honda numbers come in dashed groups. Sellers type them with dashes, with spaces or run together, so make one Spotter with the dashes and a second without.

Numbers on old parts are often small, dirty or stamped at an angle. Take a photo of the label or stamping and Spotter Otter reads the brand and part number it can see, uses eBay’s image search for clues, and writes a description for you to check before it starts. You can also paste the link to an eBay listing for the same part to start a Spotter for it. The photo isn’t stored; it’s sent to OpenAI and eBay to identify the item.

Search interchange and superseded numbers too

• Superseded numbers: makers replace old part numbers with new ones. The dealer or parts catalog will show “superseded by” or “replaced by.” Search both.
• Interchange numbers: the same part often fits other models and years. Salvage yards use Hollander interchange numbers, which group parts that fit the same vehicles, and many put them in their eBay titles.
• Aftermarket cross-references: parts brands list which OEM numbers their part replaces, so the OEM number can find those too.

When the dealer says a part is NLA (no longer available), look for NOS, new old stock: genuine parts that were never installed, sometimes still in the original packaging. For older vehicles, reproduction parts fill the gap; search for reproduction if you’ll accept one, or add reproduction, repro to Exclude if you want original.

Use the year range the way parts are listed

A Spotter’s item year range checks the years a listing states. Parts are usually sold by a span of years, like 2009–2014, so set your range to cover your vehicle’s whole generation, not just your model year. A single year can leave out a listing that names only the first and last years of the span. For the same reason, keep the year out of the item keywords.

When you search by part number, skip the year range altogether: the number already says what it fits, and many part-number listings don’t mention a year.

Or describe it in your own words, with your maximum price: driver’s side power mirror for a 2012 F-150, heated, with turn signal. Luna, Spotter Otter’s AI, turns that into a search and a list of must-haves for you to confirm, checked with the wordings sellers use, so driver, LH and left all count for the side. A listing that states the passenger side is left out, and one that doesn’t say gets a Maybe match for you to check. Confirming fitment is still up to you.

Confirm fitment before you buy

An alert means the listing matched your search, not that the part fits. Check:

• The listing’s compatibility chart. Many parts listings carry eBay’s parts compatibility table by year, make, model, trim and engine. Save your vehicle in eBay’s My Garage and those listings show whether the part fits it.
• More than the year: trim, engine, 2WD or 4WD, cab and bed, transmission. Some parts change partway through a model year; the build date is usually on the label in the driver’s door jamb.
• The side: in the U.S., left (LH) is the driver’s side and right (RH) is the passenger’s side.
• Connectors: compare the plug shape and pin count in the photos with yours.
• Electronic modules: engine computers, body modules and clusters often need programming to your VIN, and used ones may be locked to the donor vehicle.
• Paint: for body panels, match the paint code, usually on the door-jamb label (some makers put it under the hood or in the glove box).

When in doubt, message the seller with your VIN before you buy.

New, used or remanufactured

A Spotter’s condition can be set to new, or to used and refurbished. If you’d take a remanufactured part as well as a used one, the safest choice is to leave condition on Any and use Exclude words for what you don’t want.

Watch for core charges

Remanufactured parts often carry a core charge: a refundable deposit you get back when you return your old part. Read the listing for the amount, whether it’s included in the price, how and where to send the core, who pays to ship it, the deadline, and what condition the core must be in. Set your maximum price with the core in mind.

Bulky parts: use local pickup

Doors, hoods, bumpers, seats, wheels, engines and transmissions are expensive to ship and easy to damage on the way. Set the Spotter to local pickup only, within 10, 25, 50 or 100 miles of your ZIP code. Bring tools, a helper and photos or measurements of your old part, and check it over before you load it.