Hey guys so I just purchased some aftermarket wheels and went to the dealer to get them installed. the women at the counter let me know that I did need to purchase some additional equipment for the wheels. She let me know I needed bolts for the wheels and in her words the "centercap for the back of the wheel". I do have a centercap that came with the wheels but she told me there is also one for the back . I was under the impression that the stock bolts would fit and the centerbore would need no cap? These are the specs for the 4 aftermarket wheels.

Avant Garde M590
Selected options:

20x10 et25
5x112
66.56

 

I dont own an S5 but im almost certain the stock bolts are not long enough for that wide a rim. As for the center bore, 66.56 is correct..

 

There is also the possibility that you may need "tuner" bolts so the socket can fit in the wheel bolt area and yes maybe longer bolts