Eliminate rear bumper rubber filler on a 74 Duster

I agree that it looks heaps better, and lighter weight is stellar!

My only concern, since I have been rear ended hard, with lots of damage to the dart, is how well will this take an impact? I know how the body crumpled on mine, how do the earlier (pre-shock absorber) cars fare in such cases? Anymore, I consider safety a lot lol.