73+ disc brake backspacing

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Rear disks pretty much always add width to the track. And with a shortened rear axle it could be anything. The wheel info I gave was for the front anyway, which is what the OP wanted.

Missed the ''front'' wheel part !!

Yeah , mine is kind a wiered on wheel offset, going to go from an 8" wheel to a 10" , looks like I`ll have to have a 4" backspace. Need to pull a wheel and re measure for sure, have 15x8 prostars w. 3 1/2'' b.s. on it now , w/ about 9/16" spacers, and the 295 60 d15's clear everywhere but are close , the 295 65 15 drag radials were closer but cleared too.