You could use any of those original flasher switches but need to test and power up the switch on your work bench to sort out which wire is witch. 6 or 12 volt will work but may have to replace the pilot bulb to suit. Of course the flasher unit would have to be the correct voltage also. Easy to do really. Using the rear stop lights as blinkers is very dangerous in my opinion because they are hard to see, and also when one blinker is flashing you only have one stop light working. Separate amber blinker lights is the only way to be seen. Isnt it better to be seen than some old codger running up the backside of your treasure. I use Harley Davidson chrome amber flasher lamps mounted down on the bumper front and rear on my 34 Ford. Also dont wire the power wire to the flasher can through the ignition switch so that the ignition does not have to be on to work the flashers if you brake down on the side of the road. Regards, Kevin.