73 Duster with AC - Water Valve Actuator looks like ?

Guys, Trying to get some basic HVAC stuff fixed and the PO did not leave me the vacuum actuator for the water valve. Where can I find one? Also, what does it look like for a 73 Duster Slant 6? My manual has a diagram but its not clear. Anyone got a close-up pic or a reliable source for one?

Thanks in advance,
RGAZ