For the 2013 GMC Acadia, the low- and high-beam bulb size depends on the headlight system. Models with halogen headlights use a 9012 bulb for both low beam and high beam. Models with HID headlights use a D3S bulb for both functions. Confirm the headlight type before ordering.
Fog light fitment is listed as either H11 LED or H16 LED. The front turn signal and parking light use 7444NA bulbs, while the front side marker uses 194NA. Reverse lights use 921 bulbs.
Several exterior lights are listed as LED assemblies, including the brake lights, center stop light, daytime running lights, license plate lights, rear side markers, tail lights, and rear turn signals. Interior fitment includes a 212-2 dome light, 168 or 917 map lights, a 921 trunk light, and a 6612F vanity light. The automatic light listing uses a 2721 bulb.