When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
First do you have an A4 or M6? But ill tell you the codes anyway. If your car has an A4 your rear gear options will be a GU2 which is a 2.73 or a GU5 which is a 3.23. If your car is an M6 it will be a GU6 which is a 3.42.