Tino,
The wheels will fit fine on the '83 Grand Prix, but as you found, you cannot use the aftermarket centers that bolt on. The spindle is too long and will interfere with the lock nut and stud on the center cap mounting plate. I have run a 15" rallye on my '83 for years. I switched my center caps back to the factory spring retaining plate and have had no fitment issues. The other alternative will be using spacer plates between the rim and rotor.
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P.O.S.I - It's not just a club...it's an addiction!
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