A few things were bothering me about the interior so I picked up the following:

Steering Column upper and lower trim (original worn by ignition)
Headlight control switch (original worn)
Steering wheel RS6 emblem (original faded)
Side mirror control switch and OEM GPS switch (original worn)
Center armrest lid (original tired)
rear center console lower trim
set of OEM RS6 plus aluminum pedals

I got all the parts from BKS-Tuning at very competitive prices and the transaction and shipping etc were very smooth