Crowbar65, Just finished putting disc and power brake unit from CPP on my 56 GMC. I had no major problems, took a minute or two to figure out which way to mount caliper braket. I did spend a little time adjusting the linkage to what I thought was correct, a little guidance in the instruction sheet would have been nice. My Stock wheels (6 lug 16 inch) just barely hit the caliper, solved the problem by purchasing a set of 3/16 inch spacers from CPP (about $20), lug bolts are long enough to support the use of thin spacers. Bled brakes and test drove. Work great. I would have to recommend this product, no problems that were not easy to overcome. Roy
