For the 2021 Ford F-250, the low-beam and high-beam headlights both use an H13 bulb. This shared fitment covers the two primary headlight functions, so verify the existing bulb marking before ordering a replacement.
The fog lights use a 9140 LED bulb. Front turn signals and parking lights use 7444NA, providing the same bulb fitment in both locations.
At the rear, the brake lights, tail lights, and rear side-marker lights use 3157 bulbs. The center stop light uses a 912, while the license-plate lights use 168 bulbs. No reverse-light bulb fitment is listed in the supplied data.
These fitments are specific to the listed 2021 Ford F-250 data. Check the bulb socket and vehicle equipment before purchase, particularly when replacing LED fog-light bulbs or servicing multiple rear lighting functions.