74 non-shock bumper brackets

The standard bumpers have an angle bracket piece that mounts between the bumper and brackets. It's basically a bolt-through which can include bumper guards. It can be left out for weight savings.

The shock absorber bumpers have a huge, heavy structure that is in between the bumpers and shock brackets. Bumper on the front & shock brackets on the back. This necessitated the use of "fillers" between the bumper & grille.

The only thing I can think of is to see if any of the '74 shock absorber bumper holes line up with the '73 brackets. Whichever ones don't, you might be able to weld extension tabs to the brackets to reach the bumper holes that don't line up and drill for carriage bolts.

I had a similar issue years ago and believe a pair of holes on each side (outers or inners) will line up.