71 Duster Wheels

Im looking to get rid of my stock steelies on the Duster and go with some rallyes. The wheels I'm looking at at 15x7 with 4.25" of backspacing for the front, and 15x8 with 4.50" of backspacing. I just wanted to double check fitment with the forums before I pull the trigger and have wheels that potentially don't fit. Thanks guys!