That's when I entered hell. Do you think I could find a single part for a dash mounted hydraulic control? No chance.
The picture below shows the project to build the missing parts. The levers on either side of the compound lever are the pieces I made. The long of the two is made from two pieces and the short one is made from three. The link arm on the right is also one I made.

The way this thing works is the compound lever in the middle free pivots on an intermediate shaft and converts the long throw of the right operating lever to the short throw of the control valve. The other two levers are pinned through the shaft with two 7/32" groove pins and perform the same function for the left operating lever. I'm thinking a bit over engineered but what do I know?
I've still got to find an operating lever or make one but this stuff will go in tomorrow and finish up the mechanical work under the console.