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62 1/2' across the hub faces is a figure I have seen posted for the late models
The '88+ are 18mm wider each side than the early models on account of the different brake setup
You can accomplish this yourself and the numbers will be on "the button"! With your car level on the ground measure from the inside wheel lip to the inside wheel lip on the other side. Remove your wheels and measure the "backspacing". Add the backspacing X 2 to the measurement should accomplish the task. How's that?