The upper hose is also available from Kubota. Part#K7311-85150. This is for a UTV and the end will need cut off but it fits and looks great.
https://www.ebay.com/itm/125433815801
Here is that same hose on our members 1711Cub's 782d.
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Charlie is a great sponsor so it's good that you purchased from him.
That water pump belt is a Gates 7320 and probably a good time to change it. That engine assembly is pretty easy to pull on those diesels and would probably make changing the pump a lot easier.
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