For the 2008 Cadillac XLR, both the low-beam and high-beam headlights use D1S bulbs. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so verify the original bulb before ordering if the headlamp assembly has been changed.
Front fog lights use 9045 bulbs. Front turn signals and daytime running lights use 3757A. The reverse lights use 3156, while the brake lights, center stop light, tail lights, rear turn signals, and rear side markers are listed as LED.
Several smaller lamp positions have alternate listed sizes. License plate, parking, and front side-marker lights may use 2825 or 98, so compare the original bulb. Step and glove-box lighting may use 194 or 7441. The courtesy light is listed as either 561 or 212-2; compare the original for the correct option. Interior, map, and trunk lights are listed as 561, 212-2, and PC168, respectively.