Cool artwork. I am doing bulged fenders and a flare on my Firebird and we measured the other day and I am using a 19x10 wheel with about 5 inches of lip, so I think the backspace is a little under 5 with the pad. I can look back and confirm. We did mockup and are planning on going with 62 inches WMS for the rear end. I know the Camaro and Firebird wheel arches are a little different, but I can show you a picture of how much you would have to add to get the wheel to tuck in.
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Stephen
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