I have a 1989 Soverign 24, with brass, opening portlights. After these past 15 years, the gaskets for the portlights need replacing. The problem is a lack of builder documentation which would show who made the hardware. The current gaskets are 3/8" square, and would take about 33" of material, but I would like to get the OEM gaskets. Can anyone help? Thanks. RD