None of our pontiac superiors came with them,and in our area Thames Valley Amb.in London Ont.was the first to use red flashing headlights on their suburbans and their bonneville,they also were the first in our area to use flashing headlights,their shop mechanic rigged it up using a signal flasher.Now I am talking mid-sixties.My boss said you want the headlights to flash use the dimmer switch.
LOL!!!!