The headlight dimmer switch is located on the drivers front floor and used to switch the headlights from low beam to high beam.
This reproduction switch is correct for various GM models which were equipped with a floor mount dimmer switch. Pre-packaged in OER box.

Applications:
1967-81 Camaro
1964-73 Chevelle
1963-76 Corvette
1964-83 El Camino
1967-78 Firebird
1969-74 Blazer
1969-72 Caprice - For use without guide-matic headlamp dimmer.
1973-76 Caprice Classic - For use without guide-matic headlamp dimmer.
1973 Caprice Estate - For use without guide-matic headlamp dimmer.
1961-75 Bel-Air - For use without guide-matic headlamp dimmer.
1961-72 Biscayne - For use without guide-matic headlamp dimmer.
1962-75 Chevy II/Nova models.