Are replacements available? Mine are pretty much cooked. They leak and plastic is brittle. Main cabin ones are most needed. Forwards I think I can make do. Thanks
If they are available, I would think that a call to Rudy at D&R Marine is your best bet. He may or may not have a source for them, but will do his best to help. (508) 644-3001
The other possiblity is to look for a brand label on the ports, they may have come from MARK PLASTICs (I think that is the company name) they made ports for a lot of different boatbuilders in the days that our boats were built. (wish I could give you contact info for Mark Plastics, but I don't have it written down.... have heard their name from many owners of "plastic classics".)