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There are wheel adapters, but the previous owner put them on, so I don't know where they came from. I think vette brakes has them though.
Despite the front and rear tires being the same size, the wheels are different (8.5" front and 9.5" rear). I think this was from the Z51 option in the 84-86 cars. I think it's probably better to have the 8.5's on both axles. That way the tires can be rotated, and you have more tires that will fit safely.
Im running 17 by 11 C4 three piece rims on my 79, all i needed to do was get VBPs three inch wheel adaptor, and it worked like a dream, sorry i dont have any pics, ill try to get some for you