[Soupsdad]

Well, not knowing how the original brackets came off, we assumed (and you know what that means) that the brackets mounted with one inside the frame rail, one outside. The problem was the inboard bracket wouldn't line up correctly with the hole in the frame. There was too much material below the hole in the bracket to clear the lower horizontal part of the frame. So we just mounted both brackets outboard of the frame.
Again, not knowing how they were originally, that might be the way they're supposed to be. But that's the way they are now, bumper is on, and I think we're good to go.