Buying Wheels

I'm looking at picking up an extra set of 8" Welds for the back of my 90' GT for street tires. I'm wondering about going with a 4.5" or 5.5" backspace.

The tires I'm getting are 255/60 R15's.

Right now I'm running with M/T Street ET's(26x10.5) with 5.5" backspacing, but the tires come pretty close to my inner fenders and exhaust, so I'm wondering if 4.5" back space is better without having to fold in my fenders.

Any suggestions?
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Ummm... I'm going to take a wild stab here and say that the 255s aren't going to extend as far past the rim lip as the MTs are and that you should stick with the same BS.