I have the MP rear brake conversion on my 67. It consists of a 79-81 Trans Am rotor and a 85 Caddy caliper. I had 15x8 rallys on (vette rallys) it at first before I got my 18x12 Boyd's. The 15x8 fit with no problems. With the 18x12's on it the 11" rotor looks a liitle small, but not near as bad as the ricers do with 18's on them. LOL
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