ACDelco D6257C Turn Signal Switch For Select 99-02 Cadillac Chevrolet GMC Models. ACDelco D6257C Turn Signal Switch. Work with vehicle electronics to help optimize vehicle capabilities. GM-recommended replacement part for your GM vehicle’s original factory component. Offering the quality, reliability, and durability of GM OE. Manufactured to GM OE specification for fit, form, and function. Connector Shape: Rectangular and Square. …Read more »