My '64 Bambi II bumper was dinged, dented, and rusty. I had a new one made out of 2" x 3" steel box tube. The ends were angled 20 degrees to give it some shape. Two pieces of angle iron were welded on to attach (bolt) to the frame and all is good. This guy is much sturdier than the original thin C channel bumper.
I had the metal already (bought a good bit of it to fix the frame), and it was not expensive.
No need to pay too much, truly improvise, or settle for something that looks like it does not belong.
"The difference between vintage and retro is that vintage is honestly old and cool. Retro tries to be but isn't."