Used Auto Parts Prices by Part Number From eBay Sold Listings
Auto parts are one of the hardest things to comp on eBay. Titles are long, fitment lists mention dozens of vehicles, and eBay's search pads results generously. One parts seller searched a part number and found the "exact match" was "a steering wheel for a 2023 ford expedition."
The fix: price by part number, not description.
Step 1: search the exact OEM number
Put the part number in quotes so it has to appear:
"68233435AB"
Not "2015 Ram 1500 alternator". That pulls in every alternator that mentions a Ram anywhere in its fitment list.
Step 2: exclude the noise
Add minus words for listings that aren't comparable:
-core: core charges and core-only sales-universal: "fits many" aftermarket parts-"for parts"-untested: unless that's what you're selling-lot: multi-part bundles
Step 3: check interchange numbers
Manufacturers supersede part numbers, and many parts fit multiple vehicles under different numbers. Search each interchange number separately and compare medians. If one number sells for much more, list under that number too (where it's accurate).
Step 4: condition and format
Used OEM, remanufactured and new aftermarket are different markets. Filter condition to match yours. For expensive parts, compare auction and Buy It Now sales; they often differ. Why.
Step 5: use the median, and check speed
Take the median of recent clean sales. Then check how often it sells: clean sales in 90 days ÷ 13 = sales per week. Parts sellers live and die by sell-through. Experienced sellers anchor on part numbers and fitment because, as one put it, if you can't separate real buyer demand from search noise, "the sell-through number isn't worth much." Sell-through rate explained.
Pricing a whole yard's inventory
For dozens or hundreds of part numbers, put them in a spreadsheet and use the =SOLDMEDIAN() formula, one row per number:
| Part number | Median sold (used) |
|---|---|
| "68233435AB" -core -universal | =SOLDMEDIAN(A2, "used") |
| "56029651AB" -core | =SOLDMEDIAN(A3, "used") |
Building parts software? The same query works over the API, and quoted numbers must appear in the title of every returned sale:
curl "https://api.soldcomps.io/v1/sold?q=%2268233435AB%22+-core&condition=used" \
-H "Authorization: Bearer $SALEHISTORY_KEY"
Try a part number in the sold comps lookup.
Frequently asked questions
How do I price a used auto part?
Search eBay sold listings for the exact OEM part number in quotes, in used condition. Exclude cores, 'for parts' and universal-fit listings, then take the median of recent sales.
Why does eBay show the wrong parts when I search a part number?
eBay adds 'results matching fewer words' and listings that mention your number only as a fitment note. Put the part number in quotes and add minus words like -universal and -core.
What is an interchange number?
Different part numbers that fit the same vehicles, often because a manufacturer superseded an old number. Search the main number and its interchange numbers separately and compare.
Sources
- r/Flipping: eBay sell-through rates and part-number search noise (Sep 2026) (accessed Oct 23, 2026)
- Stack Overflow: Avoid listings that include 'results matching fewer words' (accessed Oct 23, 2026)
SaleHistory sells an eBay sold-listings API, so we have a commercial interest in this topic. We link primary sources so you can check our work. Spotted something out of date? Email hello@soldcomps.io.