[Flying Hamster]

First, is your 99 a GMT 800? If it is, and they both have the same # of lugs, they will fit fine. G.M. used the 17" base steel wheels from 2005 thru the end of the GMT900. They upped the wheel size when they increased brake rotor size, but the wheels will fit back to 99. (16" older wheels won't fit in the front of the newer GMT800s)