are you making your own rear rotors or trying to find one close to it? Most rear bbk for the mr2 req using rx8 sport front rotors and extending the 93 caliper. I don't really like this as it just exessive weight and pad coverage becomes limited.
My LS430 BBK using 12.6" front rotors and 12.2" rear rotors by retaining as much from factory possible so aside from the brackets all parts are oem and no hub ring adaper required. Though my setup suffers from loosing the hand brake (lack $$) but i will have one again when i can order some spot calipers
Fronts
Rears
