Let me second the recomendation of Mark Plastics. This past spring, I was referred to them about ports on my ''74 Ensenada 20. I reluctantly followed up with the suggestion and found out that, by pure chance, they were the original manufacturer of these ports, and still had the templates in stock. With no fuss, they were able to provide newly manufactured replacements (exactly like the originals!) for a reasonable price and were delivered in only 2 weeks. Great to work with, friendly and professional product.
s/v Heart of Gold