Any thoughts on the mounts to attach a bumper and get rid of the impact cylinders to get the bumper closer to the body and remove the plastic filler that fills the gap?
That would be a ‘74 bumper with shock mounts, which is a completely different thing than a ‘73 bumper.
You can collapse the impact cylinders and move that bumper closer to the body, but it will overhang the quarters and have a strange gap there. Or you can remove the bumper and its mounts, weld in a patch panel where the shock mounts go through the lower panel, and drill the rear panel to use the ‘70-‘73 style mounts and bumper.