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I have a 1987 NA with 15" phone dials. I also have a 1988 951, not an S. I tried the 15" wheels on the turbo and they hit the calipers. I did not use any spacers.
Norm
Sorry for not following through, totally forgot and got side-tracked with another project. Early 15' pd's will work on an 86, early offset 951 w/ stock 86 turbo brakes.