an 8 3/4 i 57 and 1/8 inch drum to drum and the perches are 42in apart. thats 3 inchs shorter most b-body rears. If you are are putting them in a dart with the springs on the frame you can fit as much as 12.5 if your backspacing is right, probally alittle more on a duster.
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mopar or no car!! 99 DAKOTA R/T 69 DART GTS (CLONE) 69 DART 72 SCAMP
325/50's stock width A body Dana 11/16" clearance each side of tire with 3/8" removed from lip. Relocated springs and wheel wells per tech pages. My info is in the sticky thread.