Both are good answers above.
The part number will be on the etched on the exterior ring surface of the fan clutch. That's where mine is on the spare motor. I don't feel like checking the one in the bus.
The spare engine for my bus(similar to what you have) has 2014041C1 - which interchanges to kit masters #RV0120702-00
https://kit-masters.com/product-detail/RV0120702-00/
See if yours is the same before ordering anything.