It appears to be set up to attach to a 3-point hitch. It would fit on the larger B's and many of the L's. Looks like it has a home-made blocker that would help use the lower arms to reduce the top link tension - but it might be too much for the lower arms on smaller models. In the years it was made (80's) Kubota was importing L245, L285, L305, L345. That extra bracket may have been for a subframe that's no longer with it?