Pump Coupling for a Kubota Model 1200 Loader

[PTVJR]

I have a 1977 Kubota L225DT with a model 1200 loader. Since Kubota hasn't made parts for this loader for 10 yrs. where can I get parts from? I am looking for the coupler that connects the engine crank shaft to the pump shaft. Both the splined and keyed ends are messed up.