I 'installed' them in my garage with a jack and a 17mm socket wrench. Easy to find a set with tires already mounted as the Rs4 uses the same size as the C5 RS6. www.enimotorsports.com up in Brookfield is also a place I say you can trust to mount and balance. What's so funny about the rims being from an RS4? They rock and fit perfectly with no spacers. They seem to be pretty stout too, as far as 19" rims go, with a thin sidewall a lot of rims will take a pothole in the form of a bend. Yes, most any modern Audi rim will bolt-on...its the offset you have to be mindful of. You have to find the right fit from between a 35-25mm offset (for no spacers).