[randy500]

Your brackets are reproduction, I can tell by how they are formed where the bumper attaches, you wont like how they fit and they will bend your bumper around the bolt holes. Problem is they are not formed right in that area.
As to your question, I think the brackets you have are 4wd, maybe even blazer, they have the added reinforcement. It should be the same bracket except the upper curved lip which is clearance for the last bed bolt has been cut away and the reinforcement added. That being said maybe one of the holes was drilled wrong, compare them to your bent brackets to confirm the proper hole location, it should be essentially the same bracket but cut away like I explained.