Yeah, that’s a 73 US front bumper. That’s my bumper actually. The black rubber seal is for the early bumpers. The 73 bumper spacer piece is pictured below. Since the 73 bumpers are pushed forward about 2“, the fender mounting holes are also pushed to the front a couple of inches. These thicker spacer pieces are needed to fill in the gaps of the tapering l&r fenders when the front bumper is mounted.