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I have an 88 with factory 17's. I'm looking for black ZR-1 style wheels but have brans new rubber on my factorys. So basically I'm looking for the exact size. Would the factory be 17x9.5? Also is the C4 style GranSport wheel pretty much the same wheel as the ZR-1 wheel? Just black? I want to find everything out then post a wanted ad. Thanks for the help.
Your '88 17's should be 9.5's so you just need to duplicate that buy in the 5-spoke. You'll be faced with choices when you post and you'll have to ID what you buy. OE/GM can be of 9.5 variety or 8.5 from a '96, the 9.5's of OE/GM construction are the same regardless of color.
After-market the choices become more difficult, there are "replicas" that could pass for OE/GM except for method of construction and weight. There are others that are "similar" in appearance with wider polished/machined lips, "similar" spokes and some actually prefer these.
You buy 9.5's with an offset of 56mm and you should be all set for fit and to use with your current tires. I assumed your tires are maybe 275's?