You need adapters, not spacers, that will take you from the 5x4.75 OEM pattern to the 5x120 C6 pattern. I have the C5 rims on my Belair and bought adapters from motorsport-tech.com. For (2) 2.5" thick adapters, it was $200 with shipping. The 8.5" wheel you show is 7" backspace so you need to go from there to determine the adpater thickness you need. Perhaps others can chime in with personal experience. My Belair needed a 3" adapter on the front for that size wheel.
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69 Camaro therapy program, 410, M22! SOLD
68 Camaro - SOLD
67 Bel Air - Hmmm.
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