Just a point of clarification on correct switches for these heaters. The correct switch as discussed varies with heater type. The correct switch is the flat Delco or Cole-Hersee, rotary switches were not furnished with the recirculating, air flow or the 1947 version of the standard or deluxe heater carryover kits. There are a couple reasons for this:
1. The dash is punched to accept this switch and the adjoining hole is for the corresponding fog light switch, also flat so they go side-by-side.
2. It makes no sense to offer other brands when you have divisional alternatives available.
While I agree a lighted switch is a handy item they are not the correct switch in this application.
Air flow hardware.
https://www.flickr.com/photos/advance-design_parts_co/8129413707/in/set-72157631868452754
Recirculating hardware.
https://www.flickr.com/photos/advance-design_parts_co/8129444438/in/set-72157631868452754
1947 Standard/Deluxe hardware.
https://www.flickr.com/photos/advance-design_parts_co/8129307001/in/set-72157631868452754
Fog light switch.
https://www.flickr.com/photos/advance-design_parts_co/8129466604/in/set-72157631868452754

1950 Chevrolet 3/4-Ton 3600
More pictures on Flickr