Heater boxes can be worth a little, depends on if the fan works and the condition of course.
Some folks like myself are always interested in stock switches, knobs, and control cables (aftermarkets never seem to look the same). Ignition switch with key, esp. if the key matches the door locks (sold as a set those move well on Ebay).
Check out the horn and see if it's still functional as well.
Light housings and lenses if they are in good shape.
Any of the window glass that is in good condidtion is an easy sell too.
Emblems can be a good seller as well, depends on the condidition and if they can be refinished easily.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI
I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P