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Ay, well there's the rub--literally. The hat height on the discs I have is 1 5/8 or so. When in place, the lower hat height means the disc itself is further away from the backplate. With no pads in the calipers, you can locate them over the discs and get the caliper bolts started. However once the bolts start to cinch down and the caliper straightens out, the outer edge of the caliper cavity strikes the disc outer surface and you cannot continue. The "correct" discs, purchased today, are about 1 13/16 hat height. Only about 3/16" difference, maybe less. I use the various parts houses, including FCPG to help me in situations like this. What I don't understand is that they list the same calipers, rotors for all years, as does my local supplier and also autopartswarehouse.com. So, if your 86 takes the 1 5/8 hat and the 91 takes
1 13/16, how can they be the same part? Curiouser and curiouser. Anybody with an 88 or pre-86 want to weigh in?
DS
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