I found this site and it offers what OEM rims that could work on the Colorado/Canyon/Isuzu trucks. There are some that will need to be bored out. I also don't know much on the Offset as well, since on the Colorado it doesn't state offset. Thought this may help the next person.
Wheel Bolt Pattern Cross Reference Database and Conversion Guide: CHEVROLET/GMCÂ COLORADO/CANYON
Wheel Bolt Pattern Cross Reference Database and Conversion Guide: CHEVROLET/GMCÂ COLORADO/CANYON