Up to '87 4x4 wheels will work, 3 1/2" backspace, 0 mm offset. You can use wheels off of a Japanese truck, they will physicly bolt up, but the tire will rub the drag link on a left turn, especially if you have anything wider han a 225 tire. The late model 1/2 ton and light 3/4 ton 6 lug wheels won't work, the backspace is too deep, nor will the wheels from the Colorado/Canyon (right bolt patters, but even deeper backspace), and the Trailblazer/Envoy wheels use not only a deeper backspace, but have a different bolt circle size.
