jeffb-
I make my own and use a material that's about 1/16" thick. It's the same thickness of the factory gaskets. It allows for a retorqing of the bolts after a good warm up and use. I also use a silicone gasket sealer on the plate side but that's just personal preference. Some use it and some don't. Be sure both surfaces are very clean when installing too.
Good luck...Wayne
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