Bumpers on 74 A-body

The best I can figure is 1974 Dusters had the same front bumpers as in 1973. The rear bumpers got the shock absorber-style bumper brackets in the rear in 1974. That made them stick out further and required fillers between them and the body. 1975 -6 had the shock absorber brackets all around. Through the years, they also got the big rubber bumperettes.