I put a 97 GSR rear in my 95 hatch about 6 mo ago. Everything bolted right up without a hitch. I'm using the stock master cylinder and prop valve. So far everything is has been working like a champ. After I finish my engine swap, I plan on installing the ABS computer, and harness . I think I'll need to put a different prop valve in then. For your rear disc upgrade, try in with the stock master cylinder and proportioning valve first.