For the 2016 RAM 1500, the high-beam bulb is 9005. Low-beam fitment depends on the headlight design: use 9005 with projector-type headlights, while non-projector headlights use H11. The supplied fitment data also lists H11 as a low-beam option, so confirm the headlight style and existing bulb before ordering.
Several exterior bulbs vary by equipment. Front turn signals and parking lights use 3157 with two headlights and 3157A with four headlights. With projector-type headlights, these locations are listed as LED; without projectors, they use 3157A. Rear lighting also changes with projector-type headlights: the tail light, rear turn signal, and rear side marker are LED, while non-projector versions use 3157R, 3157, and 3057A, respectively.
Other listed bulbs include 921 for the center stop light and standard reverse-light fitment, 194 or 7441 for the license plate and glove box, and 578 for the dome or map light.