Duster - Suspension/Wheel/Tire Combo Question

Depends entirely on what rear axle you have. If it's a BBP 7.25 or an 8.25, it won't fit. Not even close.

If it's an 8 3/4 with BBP axles it will probably be too close to run on the street without some rubbing, but a small spacer (1/8") would probably be enough to clear them.