For the 2020 Jeep Gladiator, both the low-beam and high-beam headlights use an H13 bulb. The supplied fitment data does not specify a projector or non-projector headlight variation, so confirm the original bulb before ordering if your vehicle has an unusual lighting configuration.
The fog lights use a 2504 LED bulb. Front turn-signal fitment requires comparison with the original bulb: applications may use either 7442NA or 7440A. The parking lights use 7442NA.
Several rear lighting functions use 7443 bulbs, including the brake lights, tail lights, daytime running lights, and rear turn signals. The center stop light, license-plate lights, and rear side markers are listed as LED applications. Interior and auxiliary fitments include a 912 dome-light bulb, 194 ash-tray light bulb, and 2825 or 658 bulbs for the listed automatic-lighting applications. No reverse-light bulb is listed in the supplied data.