I just looked at your post/pics again.
The bumper on the left is obviously for the '71-'73 set up as it has the holes for the rubber strip mounting pegs, but the profile is NOT correct. The bumper on the right has the correct profile...ie the flat portion that the rubber strip mounts to.
FYI - if you order the #656, you should get the correct '71-'73 bumper profile, but it should have the holes for the Euro in-bumper plate lights.
Give BLUNT a call/message as he will get you the correct part at a competitive price.