IIRC, the FO-20 manual has some information on the single and dual spool non detented valves, both of which I have. Also IIRC, the single spool detented valve is covered in the Ford service manual.
As recently as 5 or 6 years abo, the banjo fittings were still available from CNH. I bought 2 or three then. IIRC, they were around $36.00 (Banjo fitting only) then.