I am having a problem with the fixed ports on my 1987 Catalina 30 leaking. I reseated them last season, but water actually seems to be coming in between the rubber seal and the glass. I'm leaning toward replacing the ports, but has anyone had luck replacing the gaskets on these ports? Where can I get replacement gaskets? If replacement seems like the way to go, does anyone have any suggestions on ports brands and where to order them? Thanks in advance for your help.