IIRC there should be another place to mount a factory valve in front of the 3pt valve there on the right side of the seat base.
This diagram shows the seat base hydraulic system:http://partstore.caseih.com/us/LambWebsterNorthJava/parts-search.html#epc::mr59117ar845051
You should have the rear stack of valves for the 3pt/fast hitch, and the front stack should just be a cover.
What you need is a factory valve to install. You just need the valve and some sort of handle. Standard "O-ring" type fittings can be threaded directly into the valves, so you can just run conventional hoses instead of having to find the factory lines.