If you can weld there are many sources at a salvage yard. I found some rear calipers and brackets off a Seville ( they have the parking brake). I went to Auto Zone and found some rotors that fit the axle (9" ford) and were the same thickness as the stock Seville rotors. All I had to do was to weld some tabs on the housing to bolt the brackets to and buy some flex lines that had the banjo fitting on one end and inverted flare on the other. You have to make sure the bleader is facing straight up or you'll never be able to bleed them. I allready had an adjustable proportional valve to adjust the front to rear bias. But I'm still thinking about switching to an aftermarket system 'caus they are a alot lighter and I still need to lose some weight. I have maybe $75.00 in my rear disc setup as compared to over $400.00 for aftermarket.