Going from the stock bulb to a H4 repin black to tan, tan to light green, light green to black. The high beam on our columns have a "double click" switch which to turn on & off you have to pull back. Modern cars have a push-pull set up with flash to pass with a half pull. I converted both columns over to flash to pass but still have the double click set up. Used the idea & high/low switch from the '76-'78 Chevette. Had to add a battery hot wire to the switch which comes off the Chevette headlight switch. Just had to replace the plastic connector for the needed cavity for the wire.