Been there, Kubota said it couldn't be repaired. My brother disagreed, so I had him fix it. I sure couldn't find a new or used one.
Mice chewed up my AC evaporator; Kubota said they only sold the whole unit; close to $200 I think. Iwas told of a place whp custom made part, sent mine in and got new one for $400. https://radiatorsupplyhouse.com/
Thanks coachgeo, no Idea how that happened; use too proof documents for courts etc.