Blog
Insights for auto parts sellers.
Guides, strategies, and market intelligence — written for the people who actually list.
Bulk Listing
eBay File Exchange error 21917122 ("Compatibilities not valid"): why it happens and how to fix it
Your File Exchange upload "succeeded" but the compatibility rows came back rejected with error 21917122. Here is what "Compatibilities not valid" actually means, the real causes — stale action metadata, K-Type vs Master Vehicle List mismatches, non-exact YMM values — and how to fix each one.
Fitment Data
"Chevrolet, not Chevy": why eBay silently drops your fitment data (and how to fix it)
You added the compatibility, saved the listing, and the rows you typed are gone — with no error message. The hidden cause is exact-string matching against eBay's Master Vehicle List, and here is how to map your text to it.
Fitment Data
The eBay Guaranteed Fit badge: how auto parts sellers actually qualify
The green-checkmark Guaranteed Fit badge is free and applies per listing — but only when your compatibility data is complete and catalog-accurate. What qualifies, what is excluded, and the exact data that unlocks the badge on more SKUs.
Fitment Data
eBay compatibility table not showing? Why your fitment disappears (and how to fix it)
You added the Year/Make/Model table, hit revise, saw a green Success — and now the compatibility table is gone. The real reasons fitment disappears on revise, a step-by-step recovery, and how to stop the disappear-on-revise loop.
Listing Strategy
How to write eBay parts listing titles and item specifics that get found
A field-by-field playbook for eBay parts text fields: the part-type + fitment + OEM/interchange title formula, which item specifics are required versus optional, and why complete fields lift impressions instead of burying your listing.
Listing Strategy
Why your eBay parts listings get no views (and how to fix it)
A listing can be live, photographed, and fairly priced — and still get zero views. The five reasons eBay parts listings stay invisible, how eBay discovery actually works, and a checklist to diagnose your own dead listings.
Fitment Data
ACES and PIES explained: a plain-English guide for eBay parts sellers
What ACES and PIES actually are, why eBay quietly depends on them to surface your listings, and how to get standards-aligned fitment data without becoming a catalog analyst.
Inventory Strategy
From months on the rack to days on eBay: a salvage parts sales guide
A pragmatic guide to converting stagnant salvage inventory into active, verified sales on eBay Motors using market intelligence and data enrichment.