Just FYI, I can confirm that the Timken 716102 is the replacement seal for the rear main seal. It is listed in their catalog as the main seal replacement for most Audi's. The seal is actually approx 2mm narrower so I just split the difference when pressing it in. I got mine from Amazon for about $20 delivered, much cheaper than the whole assembly from Audi for list of $350 and only discounted down to about $250. You will need the gasket for the flange when re-installing which is 077103181H for about $13.
http://www.timken.com/EN-US/products...on_Catalog.pdf