Looks like the OEM filter is a spin on canister. You'll have to get an aftermarket bowl type filter, or one from another Kubota model.
I am partial to the smaller Racor water separating filters.
Messick's has the industry's largest ready-to-ship, in-stock inventory of OEM Kubota parts and accessories for sale online. We ship nationwide, often same day.
messicks.com
This is a good place to look. You'll need more specific info about your model. If the OEM filter does not have a drain, you can look up the thread and gasket diameter and find one that matches.