2017 GMC Sierra 1500 bulb fitment uses D5S bulbs for both the low-beam and high-beam headlights. The supplied fitment data does not identify a separate bulb size for these two headlight functions, so check the existing bulb and vehicle assembly before ordering. No fog-light bulb fitment is listed.
For the exterior lighting, the front turn signals and parking lights use 7444NA bulbs. At the rear, the brake lights and tail lights use 7444 bulbs, while the rear turn signals use 7444NA bulbs. Rear side markers use 194NA bulbs.
- Reverse lights: 921
- Center stop light: 921
- License plate light: 2825
- Trunk light: 921
- Vanity light: 6612F
This data lists the same D5S fitment for both headlight beams and does not specify projector, non-projector, or other configuration differences. Confirm the socket and housing details on your Sierra before replacing any bulb.