For the 2004 BMW M3, both the low-beam and high-beam headlights use D2S bulbs. The supplied fitment data does not identify a separate bulb size for different headlight types or configurations, so verify the existing headlamp labeling before ordering.
Other notable exterior applications include 7507 and 2827 for the front turn signals, while the rear turn signals and reverse lights use 7506. The brake lights use 7506R, and the center stop light is listed as LED. Tail lights use 7225.
For smaller lighting, the license plate, courtesy, dome, and glove-box locations use 6418. Parking, front side-marker, step, and interior applications are listed with 2825 or 98. The rear side marker uses 5007. Trunk and vanity lights may use 6411 or 6428.