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According to the 1995 GM Service manual Section 5B1 BRAKES
Rotors: Standard on VIN P are directional 12 in. Heavy duty are ONLY available with RPO Z07 for VIN P & standard on VIN J. So, I bought a set of J55
from a forum member. Today I went to find my paint code and discovered
the J55 RPO on the label. Since its winter time I am not removing the tire/wheel! Do I already have the 13in roters and heavy duty calipers?