Why did you remove the bumper guards?

I like the way 72 darts look with them on.

My 72 dart is an LL23 Swinger special (bare bones) so it came from the factory with no guards. I was thinking it looks like something is missing so I have a pair of guards that I bought for it but I have not put them on yet. I think the fronts will just bolt on but to put guards on the rear I think I might have to find another bumper that had them because the car's original rear bumper never had them and there are no holes to bolt them on.