1966 Optional switches: Rear Air & Hazard flasher. (I need info)

https://www.forabodiesonly.com/mopar/threads/n-o-s-rare-emergency-flasher-kit-1966-barracuda.454853/

browsing on here i just now found this. looks like the light is part of the flasher kit
Interesting. My 66 Barracuda has that light for the brake warning light. Was it an either/or option, or were there 2 lights if you got both brake warning and hazard lights? Or did they use the same light for both? My first 66 Barracuda that I bought in 1976 had hazards, but I can't remember if the light was dual purpose.