Late 70s to early 90s Chrsyler & Dodge vehicles used the same temperature control assembly.
Check out this heater control thread
for more info.
Try searching ebay for Chrysler and Dodge heater or AC parts. Eventually one will show up.
The units are very fragile in the way the are fastened to the dash. I found the biggest reason for them getting broken is when someone removes the screws from the instrument cluster panel and tries pulling it out. The heater valve cable doesn't have any give to it so when you pull on the panel hard enough it breaks the mounting tabs on the heater control.