15" rims on a Duramax

[DirtyMaxLB7]

I'm Thinking about Putting 15x12 Steel wheels on my 2003 LB7 I wanna know will thay fit or will I need to get Some kind of spacer the specs of the wheel are 15x12 with a -72mm Offset 3.5 in Backspacing

[Polaraco]

Welcome

You might want to start with looking at the depth of the wheel. Are you sure 15's will clear the calipers and suspension?

[jake]

I have 16inches on mine and it barely fix inside the rims

[Zach@TTLM]

I am pretty sure a 15" wheel with not clear the caliper.