For the 2006 Cadillac XLR, both the low-beam and high-beam headlights use D1S bulbs. The supplied fitment data does not list a separate bulb for different headlight types, so verify the original bulb before ordering.
Front fog lights use 9045 bulbs. The front turn signals and daytime running lights use 3757A. Reverse lights use 3156, while the brake lights, center stop light, tail lights, rear turn signals, and rear side markers are listed as LED.
Parking lights, front side markers, and license plate lights may use either 2825 or 98; compare the existing bulb for the correct option. Step and glove-box lighting may use 194 or 7441. For the courtesy light, compare the original bulb between 561 and 212-2. The interior light uses 561, the map light uses 212-2, and the trunk light uses PC168.