Stephen,
When I replaced my ports, I bought them from Joe Palmer who used to have a business selling parts for "classic" Tartans. Unfortunately, he is no longer in business, but the ports are made by Hood. They're the traditional ports and you can buy them direct from Hood for about $300/port:
http://www.pompanette.com/pompweb.nsf/a ... enDocumentOne word of caution when fitting for the new ports: the cabin side wall thickness is only about 3/8" +/- and the new ports require about an inch. What I did was to build out the entire thickness by laminating a plywood srtip along the bottom and top of the cabin sides and fully around the port openings. I filled in the area between ports with 1/2" rigid insulation then ran 3/8" toungue and groove teak vertically and finished it off with a crown moulding. Of course you could easily build some teak trim rings for each port to build up the thickness which is what I did for the v-berth because of the fiberglass headliner. Somewhere, I have a photo documentary of the process, but here's a finished shot. Removing the old ones is a snap, they're just mating tee nuts/srews and slip a putty knife around the flange to cut the caulking. You may need to enlarge the opening just slightly for the new ports.
Good luck, Tom
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