Is that a sedan guard, or a wagon/Ranchero/Courier guard? Did you mean the bumper guard didn't exist, or the angels? Wait, what?
I'm hoping additional versions of the tool could be a Ranchero or Courier. So tooling bumper with short guards wold be beneficial. Front bumpers had tall guards like rest of line if they had them.
Here's 2 pics of very basic cars, 300 level trim, with short rear guards. I have only found 1 picture of wagon with no rear guards, and have found wagons with no front guards and tiny rear ones.
BTW, I was wrong about 58, but these are the weirdest little bumper guards I've ever seen.
Link below to 223 6 powered wagon with usual rear guards.
Wonder what Aint Bea is fixin' for lunch?