I'm repairing some rot in a couple of places along the cap rail, and needed to pull off the rub rail before doing any work. Behind the stainless rub rail there is a strip of plastic that fills the semi-circular cross section of the rub rail. This has broken up in places, and I would like to replace it with a new strip. Looks as if the original backing was supplied in pretty long sections. Does anyone have a source for this material?