Being that Audi is to VW what Lexus is to Toyota, you'll need to make sure that the bolt pattern, wheel diameter the overall diameter and depth are the same on all four wheels. With all wheel drive systems, it is vital that all four tires be the same circumference for the system to work properly. The system reads the speed of each tire; A worn tire will spin faster than new tire. If even one tire is worn more than the others, it could cause premature wear to the all wheel drive system, which is very expensive to repair. This means that if you have 70% wear on your tires and you get a flat, that requires you to replace that tire, you have to replace all four. this applies to ALL vehicles with all wheel rive systems. Good luck.