I have a pair of Wheel Vintiques 15 x 8 Rally 2's that were custom ordered with 5.25" backspace to centre the wheel in the wheel well of my GTO with 275's and rear disc brakes. When I mocked up the same tires on a set of 15 x 8 Rally 2's with the standard 4.5" backspace, the tires ended up too close to the quarter, partially due to the disc thickness compared to drums.
When I figured out that I needed more backspace, I called and emailed WV and they would not give me the time of day...someone here suggested I call Summit and when I did, they confirmed they could do a custom order for me. This was about 8 years ago, no idea if they still do this.
I realize this does not answer your question about F body fitment but thought I would relay that custom backspace was available.
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Michael
1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished!
1979 Trans Am - low-buck drag car project for when I retire
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