There are 2 different offsets for the 17x11 wheels. The fbody needs the (50 mm offset which is considered the Grand Sport wheels). You will most likely need to trim the bumpstops or risk them potentially damaging the inside of the wheel on serious bumps. You might need to hammer the inner fender but that really depends on how well your rear is centered.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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