I can’t imagine it would be any different than a 15x7” Rally II which are right at 4-3/8” to 4-1/2” backspace.
Surest way to know is to pull one off your car, grab your tape measure and some kind of straightedge and check one of yours.
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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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