The Diamond wheels used on the 88 Formulas and GTs...
The '88 front wheels are 15 x 6 x 37mm
The '88 rear wheels are 15 x 7 x 30mmAny source that tells you otherwise is wrong. Flat out wrong.

The Online Service Guide........ Is wrong.
Steven Snyder's belief that the 88 fronts have a 42mm offset........ Is wrong.
Joe Torma's diagram posted by 3.6lvvt6spdgt........ Is wrong.
| quote | Originally posted by Leeloo88:If you could prove it that would be great, as I've found plenty of opinions I'd like to find these numbers somewhere in official literature.
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I don't have an opinion. I have measurements.
Official literature? Good luck. The amount of mis-information out there should be your clue that "official literature" hasn't turned up.
The only "proof" I can offer is that I measured them myself with my own skilled hands using equipment qualified to perform the task.
Your choices are:
a) Keep hunting for official literature.
b) Measure them yourself.
c) Believe me.
I recommend "b".
I'm assuming you already know what you're looking for here, but if not and you need help in the theory of how to take the necessary measurements, please let me know.
-Bruce at FTF Engineering