Ashatsea, The invoice I have for the gaskets is the Stanlock product pruchased from Griffith Rubber Mills, P.O.Box 10066, Portland, Or. 97296, Phone= (503) 226-6971.
The item # for the gasket is 31513SL with the description SL-2026 1/4 x 1
The item # for the locking strip is 37653FTSL with the description
SL-1250 Lock Strip
As you read in the above postings, the gasket replaces the original well, but there is difficulty in applying the locking strip within the 3" radius turns at the ends of the portlights.
Here are views of my portlights before and after:
'take care and joy, Aythya crew