the 70 duster will fit fine,it all depends what your trying to do,,and what is the bolt pattern on the rear of your car,,the 73 and up disc will be 4 1/2 bolt pattern,,for your wheels,,the same with the volare,,4 1/2 bolt pattern,,,
the 70 duster,, if it is orignal stuff,, will be 4 inch bolt pattern,, there are way more wheels to choose from with the 4 1/2 bolt patern,,very limited wheel selectio with the 4 inch,,70 duster,,so if you have 4 inch in the rear,,and do not plan on changing the rear bolt pattern,, then use the 70 duster,,but i would change the car over to 4 1/2 bolt pattern,,all depends how deep your pockets are,, and what your doing with the car,, you will need 2 spare tires if you change the front and not the back,,