where can I buy a float valve without entire rebuild kit?

[fsacht]

I have a'48 Merc and need a float valve. Bought a rebuild kit from a well-thought-of source and the needle has a rubber tip that won't drop down out of its seat. Where can I buy a valve assembly without buying the entire gasket, etc kit? It's a 2 barrel 94 with 59 cast into the body. All tags and other ID are long gone.