i guess you were lucky8)Im mostly talking about starters ,alternators as Ive had nothing but crappy luck with parts like those from Autozone.I bought a alternator from Autozone for my GLH and it kept going out,took it back 3 times ,my electrical system was fine,battery was brand new until I decited to just get one from the dealership.This was 6 years ago and the alternator is still working .Had alot of problems too with their starters and water pumps.