For the 2011 Chevrolet Silverado 2500HD, the low-beam headlights use H11 bulbs, while the high-beam headlights use 9005 bulbs. The supplied fitment data does not identify a projector or non-projector headlight variation, so verify the existing bulb before ordering if the truck has non-original lighting.
Front fog lights use 5202 LED bulbs, and the daytime running lights use H11 LED bulbs. Front turn signals, parking lights, and front side markers use 4157NA bulbs. At the rear, the reverse lights use 3047, while the brake and tail lights use 3047R; rear turn signals also use 3047 bulbs. The center stop light takes a 921 bulb.
For other lighting, the license plate uses 168, the dome and map lights use 212-2, the trunk light uses 912, and the vanity light uses 6612F. Confirm the bulb socket and lighting configuration before installation.