So here's where I am with my rear disc brakes. The swap consists of 96 Toyota Tacoma 4wd front rotors, Mazda front calipers, and a custom bracket i got from Johnny waugh. The first problem I ran into right off the bat is that it placed my calipers too close to the frame.
Plus it looks retarded having the rotor and the spacer behind the wheel. My first solution to the problem was to have the wheel spacers machined down to fit inside of the rotors. This will hide the spacer and place the rotor and caliper an inch away from the frame.
And here's a a shot with the bracket installed. It uses 2 of the 4 bolts that hold the axle on.
And here's it mocked up with the caliper in place. Ignore the washers, they are temporary to see how thick I need to cut my spacers