Not sure about the bumper itself, but I was looking for a car in '73, wound up buying a '74 model (Challenger! :love4: Wish I'd have kept it!).
As far as the bumpettes, in '73 the feds required 5 MPH impact bumpers front and 2.5 MPH rear (IE, supposed to absorb that level of impact without exceeding a certain repair cost). So large 'rubber baby buggy bumpers' front, medium rear. In '74 the requirement kicked up to 5 MPH front and rear, so the back got the big ones as well.
