Why all the recommendations to jury-rig aftermarket valves when factor remotes are available?
Just go get what you need from Kubota. They bolt right up and look like they belong (because they do). I can see aftermarket make-shift solutions when that is the only thing available... but when there is a factor valve designed for your tractor, that is going to be the best solution.
Because 2 remotes from kubota is about $1700. A 2 spool valve from surplus is about 210 or 220. Drill a few mounting holes, make a bracket or so, and a few hoses later, viola! Got to be cheaper then $1700.