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Not much help but I have used a set of 08 g8 gt stock 18x8 wheels, the offset is good, maybe research whatever fits an g8 and add it to a list of possibilities?
I used to have a set of 18x9.5 vette grand sport wheels, I might still have them somewhere if I do I need to try them on my 6th gen, they were +40 offset, weigh 23lbs each
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