I may be wrong, but it sure looks to me like the bracket in your first pic was heated (maybe bent, shaped?), from what I'm seeing at 3 or 4 spots that are grey colored, like they've had a torch on them for heat. (The place where the number is stamped, then at the bend coming off the bolt on spot, then to the right on the other piece.) Looking at the top of that grey spot to the right, it looks like the top edge has been either beat or maybe welded and reformed, or something. Maybe not, but when steel is heated it gets that grey tint at the heat affected zone. Also, that hole on the inner bracket flat stock doesn't have the same slotted hole as the outer (and David's), and the steel flat stock there looks newer, and drilled. And yours doesn't look shaped quite like David's. Maybe a PO had a bumper bender and had to do some re-fab work to fixt it. But that's just what I see, and I'm no expert at those year of trucks. (Except my grandfather had one about 50 years ago.
Last edited by showme; 03/20/2015 6:07 PM.