Probably not many 19/20" Chevelle guys here. Probably more 18/19". But, I have 20's all the way around on my 72 Chevelle and I don't recall the backspacing on the rear. I can call HRE and ask them from my serial #'s if you'd like. On the rear, I have a 345/30/20 on a 13" wide wheel. If you're running the stock chassis then my rear backspacing probably won't work for you because I have an aftermarket chassis and the car is mini tubbed as well to accept the 13" wheel.
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'68 C10 swb
'69 Camaro convertible
'72 Chevelle
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