Can't say for sure, but like Bulldog, I seriously doubt it, I can't get one in our M8540 either.
We had one in our Case CX80 and initially my son and I were somewhat disappointed with the narrower cab on the Kubota, but now prefer it for maneuvering through our woods etc. and it is easier to reach the grab rails when working on steep slopes. I guess it just depends on what works best for you.