Buick LaCrosse front and rear turn signal bulb sizes include 3757NA, 7443NA, 4157NA, 7440, and 7440NA options depending on location and model variation. The replacement chart covers 2005 through 2018 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Left Turn Signal
Years
US Type
EU Type
Shop
2010-2013
3757NA (For vehicle with High Intensity Discharge Headlights)