I have one of the cheaper chrome ones on the front of my 52. The price was right, so I'm not complaining. First I sanded the rust off the back where it wasn't plated. Then I painted the back silver, and clear coated the entire bumper. That was a few years ago, and it's starting to rust again.
My friend put the stainless bumpers on his 52. He polished them to get them almost as shiny as chrome. The other day he bumped a post. I commented that if his bumper had been chrome, the chrome would have cracked. With stainless you just polish it out.
So I recommend
1. Stainless
2. Triple plate
3. Chrome, but only NOS, which we can't afford.
