Father-Son 1974 Duster Project

I was worried about getting good measurements to make the rear bumper brackets. But it came to me I can use the old inner bumper to get most of the measurements I need, then I just need to place the bumper on the buckets again to get the exact projection distance I need and I'm done. I'm thinking a piece of 3x5 angle with a 1-1/2 x 1-1/2 welded under it to catch the top holes and another cut to length with a return on it to catch the bottom bolt.