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Although they are not real Cobra R's, I had these on my 1990 and they fit fine. Just a little bit of rubbing in the front when at full turn. The guy at wheelreplicas said these wheels have just a little more offset to them in order to fit the pre-92 Stangs that didn't have the larger wheel wells.
289 - I have since sold my stang, but I am pretty sure i was running the 235/45/17 on the front with my Cobra R's. Might want to get some other opinions though, as my memory may be wrong.