The rule
No listing page — ours or anyone's — can guarantee a part fits your exact car. Fitment is confirmed with the seller, before payment, using your car's real details. Everything else is a guess, and guesses get expensive.
The checklist: send all five
- Year — model years change mounting points mid-generation.
- Model and chassis code — "3 Series" isn't enough; E90 vs F30 vs G20 are different cars underneath.
- Trim and engine — brakes, intakes, and exhausts vary by engine and package.
- VIN — the seller can decode exact factory specs from it. This is the single best thing you can send.
- Photos/measurements — for wheels: bolt pattern, center bore, offset range. For aero: a photo of the mounting area.
What a good seller does
They confirm in writing: "Yes, this fits VIN ___." They may ask for measurements or photos back. That back-and-forth is a good sign — it means they're actually checking, not just saying yes to get the sale.
Red flags
"Fits all models," instant "yes" with no questions asked, or refusing to confirm against your VIN. If they won't put fitment in writing, don't put money down.