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as far as i know there is no difference in the doors or fenders, and is true the front bumper, valance, and grill are different for each 70 (71,2,3) but interchanging them is no problem
O.K. It looks like the only diff. is the 73 fender is about one inch wider in the bumper area to allow for small front end impacts without damaging the fenders. So, as long as I don't hit anything, I'm good. I'm thinking about just using the 72 bumper and grill and getting rid of the impact bumper.