As the title suggests, I'm lost as to where to find part numbers myself. I know this may be a stupid question, but if you don't know, ask, right? I see people asking what part numbers they need for x, y or z, and other people provide answers, is this just down to personal experience or asking Audi themselves? I've come across a few websites offering the service, but they're either not very complete, or want to get back to you. Is there an online Audi directory for part numbers or something?