Bobcat S590 engine

We bought a Bobcat S590 at auction that has a bad engine. Need to replace piston rings, rod and main bearings. I have bought many parts for Bobcat kubota engines and they were easy to find. When researching this engine, it turns out it is not kubota but a Bobcat D24NAP engine. Upon doing some more research, it looks like Doosan makes them for Bobcat. Does anyone know if these are parts that I absolutely have to get through Bobcat or can I get them somewhere else?

Bobcat S590 engine