The early 4-way flasher was an accessory kit that could be dealer installed or owner installed and was really a plug and play installation. These were made by Flarestat and offered through the various GM divisions. They were also available as aftermarket pieces and used on trucks and tractors as well as cars. Some of these even had logos on the pull knob such as the Chevy Bow Tie, GMC, IH (International Harvester) etc. A similar piece was offered by Roberk that was only available at retail stores.
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