used to see lots of steel box bumpers with the dealers name stamped into it. Doubt that those were factory. I think that they were more common in the 70's and on work trucks, where the owner would need something heavier than the cheap ones they came with. Certainly, not all of the trucks at the dealership did not have them in 92, it was a $200 option. But you could buy a new bumper for $110. Thats what a lot of people did then.