I'm sure someone will chime in with more information than me...I'm still learning

not sure how the loader is attached, but I added a 4-way front blade to my
b7100 and there seemed to be two methods to access the tractors hydraulics.
1. The diverter valve under the seat which I thought the "old style" b7100s came with??? See attached:
2. The "hydraulic block" which came on the "new style" b7100s or possibly all the HST tractors??? I ended up tapping into this instead of the cap assembly route.
If your tractor doesn't have the valve under the seat, Kubota offers the cap assembly kit p/n 66404-36600 which should include all the parts you need.
Then comes the discussion about the control valve. I believe using this cap assembly you need the standard control valve not the power beyond like I needed.