For the 2005 Dodge Ram 3500, both the low-beam and high-beam headlights use a 9007 bulb. The same 9007 fitment serves both functions in the headlamp assembly, so verify the existing bulb and connector before ordering.
The fog lights use 9006 LED bulbs. Front turn signals and parking lights use 4157NA. At the rear, the reverse lights use 3057, brake and tail lights use 3057R, and rear turn signals use 3057A. The center stop light and trunk light both use 912, while the license-plate lights use 168.
Interior fitment can vary by the original lamp installed. For the dome light, compare the original bulb with 578 or 579. The map light may use 194 or 212-2, so check the existing bulb before replacement. The engine light uses 561.