Mine needed it too, I haven't done it yet but this is what I have found. Taco makes a vinyl rub rail in two sizes that may work. I was going to skip their plastic mounting rail and attach directly to the boat as the current rail is. Taco V11-3161 and V11-0232 I think the smaller would fit but it only comes in 50 ft sections and I would like it to be on piece which means something just over 60 ft is needed. The larger product comes in 100 ft section and a larger price tag.
Post it you find something else and do it. My project is on next seasons list.
Dan