portal

I recently purchased an 1973 Ericson 29. I need to replace the rubber sealing that is installed around the circumference of the portal, they are leaking. Do I just find some closed cell foam or is there a replacement available. Any info would be greatly appreciated.

I need to service the water seals on the four portals on my Ericson 32. Is anyone aware of a schematic or procedures for disassembling and repairing 18-year-old portal seals? Thanks, Chip Whispering Swan Quantico, VA:egrin: