The Kubota hoe is the 4672. It's a 3PH mount, but it requires that you replace the 3PH top link bracket/anchor on the rear of your tracotr with a more heavy duty one that wraps around the top of the trans and bolts down in more places. Also requires are two metal bars/stays that bolt on one end to the lower trans case where the axels come out, and on the other end bolt to the loader frame about mid-ships. These bars/stays help provide more lateral strength. The rest of the 3PH mount is easy, and the linkage on the BH has a brace to lock the position of the top link so it's impossible for the hoe to raise up and down on teh hitch as a normal implement would. This is an important safety feature to prevent the hoe from pinning you against the roll bar. Last, there is a taller roll bar that's recommended. I'm 6' 3" and really wacked my head several times on mine, so if you are tall I'd get it. There is a reasonable trade in allowance for your old roll bar if you buy it in conjunction with the Kubota BH.
The other hoe I know of that works is the Woods 6500. For all intents and purposes it's the same, except it has a subframe that permanently bolts to the hoe and sticks out 4 feet or so. There is a receiver bracket that bolts to the loader frame min-ships. To mount the hoe, you remove the 3PH draw bars (a minor nusance), then back the tractor up to the hoe. The fram engages the draw bar hitch pins in the rear, and the bracket at the middle of the tractor and locks into place. People consistently report that the frame mount "feels" more solid when in use. Be warned that the receiver bracket you bolt to the tractor prevents mounting an underbelly mower without unbolting and removing the bracket. Also, the BH hangs further behind the tractor and lower to the ground with the woods frame verses the kubota 3PH mount, so if ground clearance is an issue, keep this in mind.
Both have self contained hydraulics that run off the PTO, both have a 6.5" digging depth, and essentially the same digging power.
The woods seems to run around $5500 and the Kubota $6300 or so - not cheap.
As for performance, they do work well, but their reach is very limited. You should expect to do lots of repositioning of the tractor and moving of dirt piles to make room, but for occational use, they are quite effective, not to mention a blast to use. The toy factor is not to be underestimated!
Have fun.
