Buick Regal 2003 Bulb Size
Bulb size chart
This page helps you verify the bulb sizes for the 2003 Buick Regal by lighting position, so you can match the correct bulb to each exterior and interior lamp before you buy. Because Buick used different lighting setups depending on trim, package, and market, checking the exact location is the safest way to avoid ordering the wrong part.
For the 2003 Buick Regal, common fitments include 9005 for the high beam headlight, 921 for the center high mount stop light, 3057R for the outer tail and brake lamps, and 1156 for the reverse light. Interior and small exterior positions use several smaller bulbs, including 194, 7441, 906, 2886X, and PC74, so this year page is a practical reference when replacing one bulb or doing a full vehicle refresh.
Fitment can vary by body style, trim, and lighting package, so always compare the bulb in your car with the listing on this page before ordering. Halogen bulbs are the original-style choice for most positions, while LED replacements may fit physically but can change brightness, beam pattern, or warning behavior on some setups. If you are converting from halogen to LED, check whether the bulb is used in a reflector housing, a signal function, or a courtesy lamp, since the best replacement can differ. When possible, remove the installed bulb and read the number on the base before purchase, especially for positions that have more than one listed option such as courtesy lights.
FAQ
What are the high beam bulb sizes for a 2003 Buick Regal?
The high beam headlight bulb size listed for the 2003 Buick Regal is 9005.
Which bulb fits the center high mount stop light?
The center high mount stop light uses bulb 921.
What bulb does the front turn signal use on this Regal?
The front turn signal light bulb is listed as 4157NA.
What is the parking light bulb size?
The parking light bulb size is 4157NA, which matches the front turn signal listing on this page.
Which bulb fits the brake light and outer tail light?
The brake light bulb and the outer tail light bulb are both listed as 3057R.
What bulb is used for the rear turn signal?
The rear turn signal light bulb is 3057.
What is the reverse light bulb size?
The back up reverse light bulb is 1156.
Which bulb fits the front cornering light?
The cornering light bulb size listed for this model is 3156.
What bulb is used for the front and rear side markers?
Both the front side marker light and rear side marker light use 194NA.
What bulb fits the fog light on this car?
The front fog light bulb is listed as 893, and it is noted as optional on the raw bulb list.
Are there multiple courtesy light bulb options on the 2003 Buick Regal?
Yes. Courtesy light fitment can vary, with one option listed as 168 or 917 and another option listed as 2721.
What bulbs are used for the license plate and glove box lights?
Both the license plate light and glove box light are listed as 194 or 7441.
What bulb fits the dome light and map light?
The dome light bulb is 906, and the map light bulb is 2886X.
Should I check the bulb in my car before buying replacements?
Yes. Because trim and lighting package can vary by market and body style, it is smart to verify the installed bulb number before ordering, especially for interior lamps and positions with more than one listed option.