GM parts book shows 1932-37 being the same.
9" disc. pass & 1/2 ton
10" 1933-37 large truck.
If yours has a 10" disc it has been replaced with one from a larger truck. You can use a 9' disc if you find one as both 9" and 10" use the same flywheel and pressure plate.
These disc's are special in that they have a recessed center to clear the flywheel bolts.
A 1925-29 disc will work if you come across one, it just does not have the spring cushioned center.