I bought an 2003 Audi a8 with 101,000 miles out of California the right rear window was broken. I replaced the window but there is this rubber piece I can't figure out where it goes if anyone can help me I would greatly appreciated it. The part number is 4DO839492C.
I just can't put the door back together without it just doesn't seem right. These are the pictures Thanks.

 

I found out where it goes went to the Audi dealer and they printed out the diagram door is back together. Now its time to do the real maintenance timing belt kit, cam tensioners, seals, change brake fluid, power steering flush, etc.