Just ask the real question please
First what are we working on?
1937 Airflow?
So reading a HUGE amount between the lines, I'm assuming you are talking about HAZARD flashers and not TURN SIGNAL flashers
Turn signals were standard about 55 or so
Hazards were later, 66? I don't know, and it might have varied.
You can or could buy kits for adding
The simple way is this:
The 67/ earlier hazard flasher was a 4 prong switch, but it was SPECIAL. When off, no terminal was continuous to any other terminal. When on, they were all 4 hooked together
WHAT THEY are hooked to:
Output of hazard flasher. This is different from the turn. You need one independently fused, powered on all the time
Brake light wire going to TS switch. This feeds hazard flasher to both brake lights with turn signal centered
Left front turn lamp. This will be coming out of the TS switch
Right front turn lamp. This also will be at the TS switch
Trying to find a "generic" switch to do this might be tough. I guess it would have to be "4 pole." "Four pole" does not mean "4 terminals" A typical generic 4 pole single throw would have EIGHT.