For the 2013 Chevrolet Silverado 2500HD, the supplied fitment uses an H11 low-beam bulb and a 9005 high-beam bulb. The daytime running light is listed separately as an H11 LED, while the fog light uses a 5202 LED. These are distinct listings, so match the replacement to the specific lighting function.
Other notable exterior applications include 4157NA bulbs for the front turn signal, parking light, and front side marker. At the rear, the turn signal uses 3047, while the tail and brake lights use 3047R. The center stop light takes a 921, and the license plate light uses a 168.
For the interior, the dome and map lights use 212-2, the trunk light uses 912, and the vanity light uses 6612F. Verify the bulb location before ordering, particularly where LED-specific listings are shown.