Have a 1983 Irwin 37. Need to replace the hatch gaskets. I cannot determine who made the hatches, there are no identifying markings that I can see. It appears that the gaskets were round at one time. About 3/8 inch diameter. Anybody found a source for round hatch gasket material? Can find plenty of "D" shaped gaskets, but no round ones. The hatch glass has a groove cut in it to accept the round gasket, plus the hatch body has a round track in it. Guess I could use D shaped gasket where the flat sides would meet, but the D shaped gasket material normally has 2 sided tape on the flat side for mounting. And, the existing gasket material is closed cell foam. I know somebody out there surely has replaced the hatch gaskets by now......