Heres the (grey) ports page from my Watkins Owners Homepage: Grey ports (links to Bomar)
The ports on my 1972 Irwin 37 are made by the Fuller Brush Company.(click on left column (about our portlights) Fuller Brush Company
Leaking port gaskets check out Becksons trouble page
Atkins and Hoyle websi te
Suppliers of discounted products, discontinued items and seconds: The Thrifty Mariner
Ports and Hatches Replacement: Select Plastics
From the T-30 Page, which sealents for pexiglass ? (avoid polysulfides for pexiglass) http://members.aol.com/T30SAILOR/m30caulk_po rts.html