They will NOT fit a 00-06 Fullsize SUV, and I think you might be thinking of 73+ pickups being leaf. My 71 has the triangulated two link type setup with coils, can't think of its proper name at the moment.
The front end on the SUV is the same torsion bar setup as 4wd pickups. The arms are different in a few ways. The actual mounting points are a further distance apart I think, if that's not the case I stand corrected. I do know for fact that the rear lower mounting point with the bushings is 1/2" longer than that of the 2wd silverado. Also, the SUV arm needs provisions for the torsion bar.