74 driver quality front bumper

The '74 and '75 bumpers are different. All of the '74's I've seen take regular bumper brackets (like the '73) while the '75's and '76's take the shock-absorber type of bumper brackets. There is a bolt pattern difference in the face and they will not interchange. Not sure if that applies to Swinger and Valiant bumpers from the same years or not.