If you are just looking for some shade, def check out the Rhinohide dumpster lid, I LOVE the thing!!! It is on & off without tools in seconds for trailering, and is compatible with low clearance doors. It also allows free movement of ROPS. I am 5'11" and there is plenty of room under it. I'm so happy with this cover.
If you go to the KubotaUSA site and build a tractor similar to yours, one of the options is canopies. You can see what is offered for the current models. All models seem to have 3 offerings and the fiberglass seems to be the less expensive of the options. Will it be a direct fit to your tractor? Your guess is as good as mine.