McMasterCarr sells these plated metal snap in plugs which are a match for the liner holes in my 1981 C&C 34 if that helps https://www.mcmaster.com/catalog/126/4029 No idea if they are original or the previous owner replaced them at some point but they are shiny so they look pretty sharp. The old ones in the boat did start corroding eventually but they are easy and cheap to replace. Nathan
S/V Wisper Lynn MA
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