Factory bulb sizes and relevant BulbFacts-tested replacement evidence for the 2017 GMC Sierra 1500.
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
High/Low Beam Combined: D5S
High/Low Beam Combined D5S
The DDM Ultra Xenon is the value pick because the 5500K version delivers strong low-beam performance at a much lower price than the major premium brands.
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation.
Available exterior and interior lighting data for this model year.
Fitment, factory-system research, and BulbFacts product tests remain separate evidence. A matching bulb size does not by itself make a conversion a vehicle-specific recommendation.
| Position | Bulb or system | Evidence status |
|---|---|---|
| High/Low Beam CombinedLighting: HID | D5S | Likely fitment |
Fitment note: Verify the installed bulb, connector, housing, and factory system before ordering. A bulb-size match is not automatically a conversion recommendation or proof of vehicle-specific testing.
