For the 2019 Ford Flex, headlight bulb fitment depends on the headlight type. Models with halogen headlights use an H13 bulb for both the low beam and high beam. Models with HID headlights use a D3S bulb for both functions.
Fog light fitment is listed as H11 LED or H16 LED. The front turn signal and parking light use 3457A bulbs, while the reverse light uses 921. Brake light fitment varies with the headlight configuration: halogen-equipped models use 4157R, while HID-equipped models use LED brake lights. The center stop light is LED.
Additional fitment includes 6418 for the license plate light and 578 bulbs for the dome and trunk lights. Map lights are listed as 2825 or 98, and the glove-box light uses 161. Rear lighting also varies: the rear turn signal is 4157 with halogen headlights and LED with HID headlights. Check whether the Flex has halogen or HID headlights before ordering.