For the 2018 Ford Flex, headlight bulb fitment depends on the factory headlight type. Models with halogen headlights use an H13 bulb for both the low beam and high beam. Models equipped with HID headlights use a D3S bulb for both functions. Confirm the headlight setup before ordering.
Fog light listings include H11 LED and H16 LED options. The front turn signal and parking light use 3457A bulbs, while the reverse light uses 921. Brake and rear lighting also vary: halogen-headlight models list a 4157R brake bulb, 4157 rear turn signal, and 168NA and 194NA side-marker bulbs. HID-headlight models use LED lighting for the brake, rear turn signal, and front and rear side markers. Tail-light listings include 168 and 917 for halogen configurations, LED for HID configurations, and 4157R as an additional listing.
Other listed locations include a 6418 license-plate bulb, 578 dome and trunk bulbs, 161 glove-box bulb, and 2825 or 98 map-light bulbs.