Doctor Diff 1/2 offset spring hangers are back !

To further complicate things I bought a pair of 15X9 wheels with four inch bs. They had worn out 275s on there, but I bolted them on anyway for mock up. Looks like I need five inch back space.

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I don't remember the backspacing, but that's what mine were. 15 x 9 Centerline Auto Drags.