Sliding Windows in pilot house, moss included

[billr]

I've got sliding windows on the side of the pilot house that I need to replace. They are in aluminum frames, the type that have a fiber brush-like weather seal, sort of like what you see for automotive use. Since the boat is in the PNW (Anacortes area), the lower part of the frames also host a substantial moss garden, which probably explains why the windows have to be replaced (full of cracks from trying to free-up the window). It appears that the frame disassembles (or maybe it did 25 years ago) from the inside, but I have no idea how the fiber seal is retained. The glass is not laminated. Has anyone else worked on similiar installations or knows of good websites or references on this????