For the 2006 Chevrolet Silverado 1500, the low-beam headlights use 9006 bulbs, while the high-beam headlights use 9005 bulbs. The supplied fitment data does not list a projector or non-projector headlight variation, so confirm the original bulb before ordering if your truck has replacement headlamp assemblies.
Front fog lights use 9145 LED bulbs. The front parking lights and front turn signals use 3157A, while rear turn signals also use 3157A. Brake and tail lights use 3157R, reverse lights use 3157, and the center stop light uses 921. Daytime running lights use 4114.
Other useful fitments include 194 for the license plate and glove box, 194NA for the front and rear side markers, and 168 for the map light. Courtesy and dome light fitment varies: compare the original bulb, with options including 194 or 2721 for courtesy lighting and 578 or 211-2 for the dome light.