Hi,
I realize this topic is 4 years old and I'm late to the game (It's been four and half years.), but I checked this out as I have an '85 Pearson 36-2, and, yep, the original rub-rail needs replacing.
Integrity Marine Corps. no longer carries the rub-rail BUT their website seems cool and very helpful. I'm going to contact them anyway, when I get closer to that project, as I feel like they're a good bet on getting some help with at least a suggestion on a work-around.