I checked the backspace on a few factory Pontiac 15x7” Rally II wheels and they measured close to 4-3/8”.
I would assume just about any 15x7” factory wheel should be the same or very close.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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