Center Caps..........
 

Hello all,
I just purchased a used set of 17" rims for my 04 A6, and they did not come with any center caps. I called the dealer, and found that they go for $100/ea. How can I identify the right caps and purchase from ebay, etc.......
The new rims came off an A4 vintage 05-08 and there are possibly 6 different variations it could be. Dealer was not helpful beyond me ordering from him.
Can someone point me in the right direction?

Thank You