Rotors....
 

So I'm trying to upgrade the front brakes on my 1988 Audi 5000s. I have a parts 5000s Quattro which has the dual-piston calipers on the front, whereas my non-Quattro has only single piston calipers. The brackets and calipers fit fine on my car, but the rotors are too small. I can't take the rotors off of my parts car because they have a 5 lug bolt pattern, and my non-Quattro has only a four-lug. I need rotors that are 276x25mm, but with a four-lug bolt pattern. Does anyone know of any cars that have that kind of setup, or where I might look to find out?

could have the rotors redrilled for the correct bolt pattern.

I don't think that would work. Only one of the holes would be correct, so I'd have to drill three other holes, and then would end up with a rotor with eight holes in it. Chances are at least one of the holes would partially overlap with a pre-existing hole as well. Doesn't sound too stable to me, unfortunately.