I have been using 17" x 9" Cobra R replica wheels on my 74 for the last several years. The fronts have 235 45 17's and fit with no problems. The backs have 285 45 17's and they fit but required using a 1" spacer and longer studs which required disassembly of the uprights and a trip to the machine shop to get the old lugs pressed out and new ones pressed in. I have been very pleased with the result.
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