Projects Clutch issues 36 ford

I am building a stock 1936 Ford Ute (aussie car/ truck) I bought a stock 1 3/8 opening clutch. The output shaft from my transmission is larger. Possibly since it's a ute, it has a truck transmission? What sized clutch do I need and who sells them?

 

Measure the input shaft diameter and count the splines. Clutch discs are somewhat universal, the same parts being used by several manufacturers. Dirt simple and cheap (as anything can be down under)

jack vines