For the 2003 Buick Regal, the supplied fitment data lists a 9005 bulb for the high beam. No low-beam bulb is specified in this data, so verify the original bulb before ordering a replacement. The fog light uses an 893 bulb.
Other useful exterior fitments include 4157NA for the front turn signal and parking light, 3057 for the rear turn signal, and 3057R for the brake light. The center stop light uses 921, the reverse light uses 1156, and the front and rear cornering lights use 3156 and 194NA side-marker bulbs, respectively.
- Tail-light applications may use 194, 7441, or 3057R depending on location.
- License-plate lighting may use 194 or 7441.
- Courtesy lighting has two listed options: compare the original bulb for 168 or 917, or use 2721 for the second option.
- Interior listings include 906 for the dome light, PC74 for instrument lighting, and 2886X for map lights.