Jim - actually, there are 12 different STYLES of venturi cluster gaskets used in the various 2-G series carburetors. I am not going to count the actual number of different ones (thickness, material, etc.).
This is one reason I harp on having the proper carburetor number, and not trying to "mix and match" parts. And you are correct that this can definately cause a vacuum leak.
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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