You always better off measuring your car rather than relying off internet info. I wanted my wheels tucked up into the fender so the top of the wheel is level with the quarter lip. Also you are usually better off with more backspacing then using a small spacer to adjust if perfect.
All I can tell you is that 7.75 fits perfect on my car.
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Nate
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71 Nova. "The Green Machine" April 11' PHR
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