For the 2013 Ford F-250, the low-beam and high-beam headlights both use an H13 bulb. The supplied fitment data does not list a headlight-type variation, so H13 is specified for both functions.
Front fog lights use a 9145 LED bulb. Several exterior lighting positions use the versatile 3157 bulb, including the front turn signals, parking lights, rear side markers, tail lights, brake lights, and rear turn signals. The reverse lights use 921 bulbs, while the front side markers and license plate lights use 2825 and 194, respectively.
Interior fitments include 578 for the dome light, 906 for the map and engine lights, 161 for the glove box, 912 for the trunk, and 194 for the courtesy light. Verify the existing bulb and socket before ordering, especially when replacing LED-equipped fog lights.