Colin, I had a thought this morning about your problem. Here's my idea-Instead of redrilling rotors or trying to find non-existant/hard to get dual pattern wheels, how about redrilling the rear axles for the 5x5 pattern, then use late RWD Caprice police/ Impala SS rotors? I think that the rotors are the same or at least close to the overall diameter of the Camaro peices, and they have the 5x5 pattern. Just a thought.