Thanks Scott!
Another update... My 1972 C25 parts truck had an aftermarket heater control panel installed in it. So I removed it to use in my 1972 C15 that had the original unit with 2 busted levers.
Once I got them both out and sitting side by side... I didn't like the aftermarket unit. Instead of the decorative "ribbing" on the face being metal like the original, the "ribbing is nothing but a foil sticker. The 2 good things about the aftermarket unit were the levers are steel and not pot metal, and the heater fan switch is the exact same switch (even the manufacturer) as the old original switch.
So I kept my 1972 control panel and installed the aftermarket levers and knobs, and used the newer fan switch. EZPZ...
The aftermarket panel also had smaller lettering on the "DEF" "AIR FAN" "HEAT" side. So I am glad I used the original with new levers.
Gary