Back to rear bumper brackets. I'm contemplating making my own as I would like the bumper to be a bit closer to the back of the truck. Should be easy to get some 3/8" x 1 3/4" flat bar and bend to suit.
The original brackets are made of spring steel (don't know about the repops), but plain ol' mild steel flat stock will be pretty soft and bendable in the instance (heaven forbid) of a rear-ender.