I have the Stainless Steel Brakes rear disc conversion kit. I think I paid ~600.00. Comes with new rotors, calipers, and all the conversion hardware for the rear to work with your 4 lug axles. I went with Cobra R style wheels so wheel choice was not a problem. The kit is the A112 Kit I believe. Mike Forte is a SSBC dealer, thats where I got mine.
Brendan
Brendan