When you need a carburetor rebuild kit or float, the parts person is going to ask you for your carburetor name & number.  Here's how to find the information to give them so they can get you the right parts.

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MARVEL SCHEBLER CARBURETORS

This includes Marvel Schebler TSX carburetors used on most makes and models of tractors and DLTX carburetors found on John Deere tractors.

INTERNATIONAL - IH/FARMALL

Farmall and International tractors used Marvel Schebler carburetors (see above) and International and Zenith carburetors as described here.