The 2015 BMW X4 uses either D1S or LED lighting for both the low-beam and high-beam headlights. Confirm whether your vehicle has D1S or LED headlamps before ordering, since these are different headlight configurations and the bulbs are not interchangeable.
The fog lights, daytime running lights, parking lights, tail lights, rear side markers, center stop light, and license plate lights are listed as LED. Front turn signal fitment depends on the headlight setup: vehicles with HID headlights use a 7507, while vehicles with LED headlights use an LED unit. The rear turn signals use a 7507, and the reverse lights use a 7506.
Brake light fitment varies with adaptive lighting. Models with adaptive lighting use 64136, while models without adaptive lighting use 7506R. Interior applications include a 6418 courtesy light, 2825 or 98 for the glove box, and 6411 or 6428 for the vanity lights. Verify the existing bulb and vehicle configuration before replacement.