For the 2001 Ford F-350, both the low-beam and high-beam listings include 9007 and H5054. These are alternative headlight fitments, so identify the bulb type already installed in your truck before ordering; the data does not specify which headlight housing or configuration uses each one.
Fog light fitment also varies, with either 9006 or 9145 listed. Check the existing fog-light bulb or socket to confirm the correct choice.
Common exterior bulbs include 3157 for the front turn signals, parking lights, brake lights, tail lights, and rear turn signals. The reverse lights use 3156K, while the front side markers use 194. The center stop light takes 922, and the license-plate and courtesy lights use 168.
Interior applications include 578 or 912 for the dome light, 912 for the engine compartment, and 906 for the trunk. Instrument and indicator applications use PC-series bulbs, including PC194 for the instrument panel and PC74 for several warning or indicator locations.