will 1992 SC rear brakes fit a 1990 SC?

The 89-92 rears are the same. The 93-up have thicker rotors and the calipers may be different as well. Even the 93-up would fit the earlier models if you get rotor, pads and calipers as a set.
 
George is correct on the year split, but the later ones are actually thinner rotors than the early.

cheers
Ed N.
 
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