Yes you can get it from Kubota. Kubota doesn't give out the information too much, but it is available. The problem is, most dealers don't know how to get them, or who to contact to get them. They issues a bulletin a while back, gosh I want to say 3 years ago? that had to do with harness connectors.
Another option is to find someone who has an old wire harness and ask them if you can buy the connector. I used to have a complete uncut harness listed on this site, for an L3301HST, had zero interest. So, what I started doing was looking for threads like this (need a connector) and I'd sell the connectors off of the harness. Sold all 3 injector connectors for $25/ea + shipping. Just an example. Dealers a lot of times will save harness parts just for this purpose so you might call dealers and ask them.