That makes sense. Bulk bought items usually aren't packaged individually.
Can't be sure (it was 20+ years ago) but my old D150 had a control that looked very similar to the one's used in cars, except it was heat only with no vacuum switch. Knowing how Chrysler used the same part in multiple models for multiple years, they most likely were used in trucks and vans also. Only thing I recall is seeing some with chrome buttons and knobs. Not sure if they were the same panels though. I seem to remember my '78 Cordoba had chrome but, like the truck, the memory fades after the car's been gone for almost 25 years.
Well,,,,,,,,I guess they did make the control panels with chrome around the slots. Found this picture with a BING image search. Part number says it's 3846345. Who'd a thunk it?