Why did you remove the bumper guards?
I read somewhere that it was a common thing in the old days to often "bump" the car in front or behind you in a parking lot or when parking on the street. It also was common to lock bumpers with the way most bumpers were shaped in early auto days which actually cased more damage and caused an embarrassing scene.
The little guards simply prevented the bumpers from locking if you accidently bumped another car which is why they were not federally mandated till the mid 70s but highly recommended for most people.
They were an extra cost option until the mid-70s when they became federally mandated in an vein attempt to make the whole car safer.