Is there someone who could help me determine what these parts are and what they do? i have a problem with my car making smoke on the right passenger side. The dealer told me i need these three parts to fix the problem. They said the problem could be with the prop shaft seal, and also some valve cover gaskets as well. I also needed new window clips. Here are the part numbers and i would like some help on where i could find these things. I hope these are the right part numbers. Thanks a lot you guys for reading

Audi parts needed:
prop shaft seal
018409399B
valve cover gasket
078198025
058198217
window clip 4b083746B

By the way, i have a white 2000 Audi A6 2.8 quattro.