There's a tapered stud which screws into the drag link like a tie rod taper. That's the control valve setup on the far end of the tapered stud.
It has a degree of built in movement to the control valve. This is so when you turn it, there is initially slight unassisted movement. This meets resistance because the ram is currently "pressure neutral". Forcing the control valve stud against this resistance, opens the way for fluid pressure to be unequally applied to the ram - exhausting one side and filling the other. This is your power assist.
The ram cam be cobbled onto almost anything with a drag link and a place for the chassis bracket, but make sure the welds are safely done. The control valve normally fits on the drag link end, engaging into the Pitman arm. You'd have to check your situation here (Transit?).
Does this help, or have I made it more confusing?