Backhoe I need a backhoe pump coupler

[JM354]

good morning everyone,
In the process of assembling my JM354 tractor I realized the factory didnt send me a pump coupler for the JW-03 backhoe pump. This is the coupler that attaches
the pump shaft to the shaft behind the cover plate on the rear of the tractor.
I was hoping to find one stateside, otherwise I will have to order it from china.
As far as I can tell from the parts manual the part number is 300.54.108

Thanks
John

PS this is cross posted on CTOA.