15x10 steel wheel with 7.25" backspace?

I have a pair of off-the-shelf centerline autodrags, 15x10 1/2, with 7 1/8 bs. They were 5 on 4", but have been double drilled for 4 1/2 pattern. They were basically a 15x14 back half, with a 15x8 front half, factory assembled. Looong ago
discontinued!
The wheels on the car are 15x8.5 centerlines, also originally 5 on 4, now double drilled. 4 7/8 bs.

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