For the 2020 Chevrolet Silverado 3500HD, the low-beam headlights use H11 bulbs, while the high beams use 9005 bulbs. The supplied fitment data does not indicate a separate projector or non-projector headlight variation, so verify the existing bulb and housing before ordering.
The fog lights use 5202 LED bulbs. Front turn signals and front side markers both use 7443A bulbs, while the parking lights use 7443 bulbs. At the rear, the brake and tail lights use 7444 bulbs; rear turn signals and rear side markers use 7444NA bulbs.
Other listed bulbs include 921 for the reverse lights, center stop light, and trunk light, plus 2825 for the license plate lights and 6612F for the vanity light. Match replacement bulbs to the specific lighting position, especially where the related 7443 and 7443A or 7444 and 7444NA applications differ.