Welcome to Stovebolt.

From what I find in the 1929-1957 Parts manual, you have two options (highlighted on the attached.) A good parts store can either use the dimensions and the GM PN to cross over to a current manufacturer's number.

NAPA's website says their Part #: NOS 22340 fits. It matches the dimensions in the first seal I highlighted.
Attachments
Transmisson seal.jpg (50.16 KB, 53 downloads)

Last edited by klhansen; 09/18/2025 5:46 PM. Reason: added more info

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.