Duster differences 70-71

70 Duster had standard front disk brakes and to lock the car you need the key. 71 72 Duster you could push the door lock button to lock the car. 70 had the smooth trunk lid where the 71 72 had the raised center line. 72 bumper jack has the small hook that fits in a slot in the bumpers. 70 71 has the large hook that goes under the bumper.