wheel backspacing help

[D-MAX]

I have a 2006 sierra with h2 wheels. i use 1.5 inch wheel spacers in the front, im looking into different wheels but i dont know how much back space that would be on a after market wheel. so how much back space would it it be for a h2 wheel + 1.5 inches.

[SummitUp]

The back spacing on an OEM H2 wheel is 5.5" - you do the math.