I ordered (from Weaver's Compact Tractor Parts) a crank-adjustable leveling link this past weekend, for my JD 790. The price seemed reasonable, worth the convenience that it would add, and the measurements were close enough that I took the risk. It arrived yesterday- kudos to Weaver's for fast, professional service- and checked out the fitment. It was just about right, with a couple of very minor adjustements. I needed to make a sleeve for the top mount-link pin fit, because the bore was bigger than the diameter of the link pin. That was easy. I also had to make an attachment pin for the bottom, where the link attaches to the lift arm- the JD pin wouldn't work (by its design). That also was easy, and once I knew it would all work, I painted it JD green. It works very smooth, and I can reach the handle from the tractor seat. I have a total of $130.00 in it, and I consider it a good buy. I'm sure that there are numerous Kubota models that it would fit on.
https://www.compactractorparts.com/tractor-parts/hitch-kits/adjustable-leveling-box-3
https://www.compactractorparts.com/tractor-parts/hitch-kits/adjustable-leveling-box-3