I believe Knuse is the mfg of the one we bought a few yrs back. We use it on the NH3 bar. Works great. They use a special cylinder & the mounting brackets have to somewhat match your tractor. Some tractors would require longer/shorter stroke cylinders. Not a big problem if they're a mismatch, you just may not have all the movement you think you should. But ours has been on several different brand tracdtors successfully.

If I was buying it again, I'd get the model w/the checkvalve in it. The model we have will allow the NH3 bar to "creep" after a while. Not a big deal...bump the hyd control & you're back to where you started.

This would be the viewing peering out the back window & looking down on the cylinder. It comes w/a guage to show approximate stroke usage.