Unless you want to use a proportioning valve, you need front and rear brake that are designed to work together. Such as:
RZ/Spirit R front & rear
Racing Brake front & rear
Stoptech front with optional pistons to match RZ/Spirit R rear
Brembo front & rear
When I got the Sprint R/RZ rears I got the calipers from Rx7Store.net but if I they would have been available, I would have got the Racing Brake rear that retains the stock caliper and uses a bracket to move it our further. The 93 and Spirit R/RZ rear caliper is identical except for the mounting bracket (same size piston).
Jack
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