Manual Heater Hose Valve

You should be able to find one at a "real" parts store. Get someone who is willing to help and can look through the parts illustrated guide. Might not even be Mopar, might be chev, etc. You want older stuff, maybe, 60's--80's non AC pickups, as the older ones were cable operated.

A quick Google turned up this:


X2 my 78 power wagon has the same valve, NAPA sells them.