Okay, this is what I came up with, 55 7/8" between mounting surfaces of the rims with 1" clearance all the way around. The rotors are 3/8" thick each. I'm thinkin I should drop that 55 7/8" to 55 3/4", subtract the 3/4" for rotor thickness and my overall axle to axle length should be 55"???? Does this sound right?? Again my wheels are 18x12 w/ 5.5" backspace on a 68 camaro?? Thanks for all your help.
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