OK, this is what I've heard....some Chevy trucks up to 1970 used this bolt pattern, then up to '87 4X4 had the right bolt pattern and back spaceing. 1988-2011 Silverados all use the same bolt pattern. I am currently running 17" after-market wheels with 265/70/17s that came off a 2006 Silverado. My brother tells me the Chevy Colorado wheels are a 6 on 5, as opposed to the 6 on 5.5 you need.
