Most parts stores have bulk gasket material on a roll, or at least by the sheet. I used to keep three different thicknesses of 18" wide rolls of gasket paper hanging on the wall of the tool room in my school shop. Trace the shape of the flange you need to seal, and use an X-acto knife or a box cutter to cut the outline of the part. Hint- - - -use a piece of plywood as a backer. Cutting gaskets out on Mama's kitcken cabinet top will get you in the doghouse in a hurry - - - -don't ask me how I know!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!