I have a 98 A4 2.8 Quattro and am looking to replace the gear oil in all of the diffs. I figure I might as well use fresh plugs and O-rings when putting everything back together, but I can't for the life of me find the relevant part numbers. Does anyone know what they might be or where to get them?

Thanks!

 

For little parts like that, you may as well try the dealer. They will be able to find what the part is much easier, and it won't be TOO expensive since they are pretty simple parts. I don't know where you would find these parts elsewhere.