I think these are good enough that I see what I need to do. Probably get some 3/16" plate, cut out a bracket, and weld a tab with a gusset on it. According to the FSM, the brake tension is set to 50 pounds of tension, and 3/16" plate will have no trouble with that. All I need to do now is roll under the truck and measure the spacing between bolt holes.
Thank you very much for taking the time and effort to take these pictures. I really appreciate it!