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My 79 has the gasket. It can be found in one of the Vette catalogs. It's like $5 plus $10 for shipping . Depending if it's 2" or 2.5", the 2.5" is readily available from the Napa's out there. I temporarily used a 2.5" gasket for my 2" EFE. It was from a '79 K-5 Blazer. It seal pretty well, but until I can do a big order and order a couple of them for future use, it'll do for now.