Looking to know what the back spacing is on 2 wheels.....hummer h2 17x8.5 and chevrolet 2500hd alloy 16x6.5........ I want to put hummer h2 wheels on my new 37-12.5-17 km2s. then put them on my 03 hd......but only if the back spacing is close with both wheels (or they will be in 2 far)......i looked for it and found all diff answers... please help guys..............