Gaskets for original Lewmar aluminum framed opening portlights. The glazing in these portlights measure 5" X 12" and has no frame surrounding the glazing itself. The ports secure closed with two dogs which rotate open and closed like turning a key in a lock.
They were used on several Catalina models in the quantities listed: (2 ea) on the CP-26, C-270, C-27, C-28, C-37 and C-42; (4 ea) on the C-30 and C-38; (7 ea) on the C-320; (8 ea) on the C-34; (6 ea) on the C-36.
Although the dates these portlights were used by Catalina on each model were not recorded, we do know that Lewmar produced them from 1982 through 1998.
Dimensions to help identify the port:
Note: Using the Catalina 30 as an example: Don't assume your 1982 C-30 uses these portlights. Catalina might have had a different brand of portlight on the shelf which they used until their supply was exhausted at a later date.