I have a set of nearly new Audi C5 recaro sport seating in black leather with matching black alcantara inserts. Removed from a 2004 S6 sedan they will perfectly replace the seats in your RS6. They do not have the side airbags but the airbags can be purchased seperatley for about $200 each or resistored to keep the airbag computer happy.
These are in the US and ready for shipment.
Pm for pricing