I've got some assorted RS6 parts available for sale. This list is the larger items, but I have a lot of other parts too. Send me a PM if you're interested in anything.

-ZF 5HP24A auto transmission. Has a clutch pack that's going out (at least I think that's the issue, it would sometimes slip slightly when shifting from 1st to 2nd). Could be good as a core for someone looking to rebuild theirs. Includes torque converter. Looking for $100 + shipping.
-Another ZF 5HP24A auto transmission. This one is in great shape. It was a warranty install by an Audi dealership and has about 49k miles. The torque converter is also included and was replaced at the same time as the transmission. It was pulled for a manual conversion earlier this year and has been in storage since then. Looking for $1000 + shipping.
-Stock RS6 sway bars with mounting brackets and end linkages. Make me an offer.
-Stock RS6 automatic transmission shifter assembly. $100 + shipping.
-Stock RS6 driveline/driveshaft/prop shaft. CVs and center support in good shape. $100 + shipping.
-Stock RS6 rear differential. Great shape. $300 + shipping.