My other car is a MINI!!!!
also worth noting that you need to make sure you have the correct heads on the bolts too.
your OEM 17'' S3 wheels will have a radiused bolt seat, your RS4 reps will almost certainly have a 60 degree tapered seat, so chances are you're actually running the wrong bolts at the moment, which isn't great news!
Generaly speaking, factory fit wheels will have Radius seats, and aftermarket wheels (including reps of OEM) will have taper seats. Make sure you get this right, as it's pretty important!
Sadly, there are HUNDREDS of people rolling around with the wrong bolts in their aftermarket wheels.