Need 1973 Duster Front Bumper Measurement

My 74 has the bolt holes in the frame. So, after sourcing the correct (. Arrg) brackets, I'm still going to need another bumper? Or drill / weld holes? Both of my bumpers are painted so that's not a major issue. I saw amd had a kit for 70-72 brackets for the front and the rear for like 249 bucks. However if I'm reading this correctly (it's been a long stressful week) that is not the be all ,end all solution?and thank you all very much for your time and knowledge!