You buy your USED car at a one-make auto dealership, LETS SAY A MAZDA STORE, and the car you buy is NOT A MAZDA.
Key words, there.
You need a factory, dealer only part.
Who do you call?
A. The dealer that sells the brand of car you bought
B. The dealer you bought your non-brand-that-sell car from
C. TEH INTARNETS