The onlt problem you might encounter is with the '73 and up cars.
Some have different mounting holes in the front frame for the shock absorbing bumpers, and on '74 and newer, the rears mounted the bumper differently with the shock absorbers.
On '75 and '76 cars, they had the shock absorber bumper mounts front and back.
Some creative fabrication would need to be done to the mounts, but it wouldn't be that hard really if you took your time and had some welding/fabrication skills.......