I replaced my '75 rubber bumpers with '71 stainless bumpers last year. The stainless bumpers are expensive, so I don't think it makes sense to do the retrofit if the car has any rust. Switching the rear rear bumper is fairly simple. For the front, I used a one-piece bumper support bracket from a '74 and some minor surgery to attach it to the '75 mounting points. You can stop by and check it out and get more details if you want to do something similar. I am on the CT shoreline. I have saved my good rubber bumpers which I can sell if you want to stay with the original style and preserve the crash protection qualities.