Several years ago a dock crashed into the side of my 1985 E26, badly damaging the aluminum rub rail. When I took the boat to the boatyard for repairs, the yard foreman told me that he thought that the rub rail was a standard aluminum extrusion, and sure enough, he found it listed in a supply cataloge.
I've found that much of the stuff on Ericsons is not custom made for Ericsons, and is available from suppliers unconnected to Pacific Seacraft.