2005 GMC Sierra 1500 bulb fitment starts with a 9006 low beam and 9005 high beam. The supplied fitment data does not identify separate projector or non-projector headlight applications, so use these sizes for the listed configuration.
- Fog lights use 9145 LED bulbs.
- Front turn signals and parking lights use 4157NA, while daytime running lights use 4114.
- Rear turn signals use 3157A. Tail and brake lights use 3157R, reverse lights use 3157, and the center stop light uses 921.
- Front and rear side markers use 194NA; the license plate light uses 194.
- For interior lighting, compare the original bulb for the courtesy light: the listed options are 194 or 2721. The dome light likewise lists 578 or 211-2, so verify the original before ordering.
- Glove box lighting uses 194, map lighting uses 578, and the trunk light uses 912.