Waterneck gasket info needed !

I’m going to try to cut out a gasket out of some 1/8” silicone rubber sheet I have from another project. I think you could likely cut 4 or more out of a sheet. They sell 12’x12” sheets of 1/8” thick on Amazon for like $13.

65D01273-2838-47D7-A604-42FD5901740A.jpeg