For the 2014 Buick Regal, headlight bulb fitment depends on the factory headlight type. Models with halogen headlights use a 9012 bulb for both the low beam and high beam. Models equipped with HID headlights use a D3S bulb for both functions. Confirm the headlight configuration before ordering, since 9012 and D3S systems are not interchangeable.
Other notable exterior fitments include a 7440A front turn signal, 7440 rear turn signal, and 921 reverse light. The brake, center stop, tail, and rear side-marker lights are listed as LED. Daytime running and parking light fitment also follows the headlight configuration: halogen models use 7443, while HID models use LED lighting. The front side marker uses 194NA. Interior applications include 6411 or 6428 for courtesy/interior lighting, 2825 or 98 for dome and map lights, and 7065 for the vanity light.