Buick Verano front turn signal bulbs use 7443NA or 7444NA size, while rear turn signal bulbs require H21W size. The replacement chart covers 2012 to 2017 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Verano front turn signal uses the 7443NA for the 2012-2015 and 2017 model years, while the 2016 model year uses the 7444NA instead.
Both the 7443NA and 7444NA are dual-filament T20 wedge bulbs rated at 12V with a 21W main filament and a 5W secondary filament, built to the ANSI standard used in the United States and Canada.
The natural amber glass in the 7443NA and 7444NA produces a yellow-orange signal color directly from the bulb, without relying on a colored lens to filter a clear light source.
Although the 7443NA and 7444NA share the same T20 wedge form, voltage rating, and wattage, they are listed as distinct part numbers and are not confirmed as interchangeable across all model years of the Verano front turn signal position.
The rear turn signal on the Buick Verano uses the H21W bulb across all model years from 2012-2017.
The H21W is a single-filament bulb rated at 12V and 21W, built to the ECE standard, which is the regulatory framework used in Europe and most markets outside North America.
The H21W uses a BAY9s base, which is an offset bayonet mount. This base type is not compatible with the wedge socket used by the T20 front turn signal bulbs in the same vehicle.
The front and rear turn signal positions on the Buick Verano use bulbs from two different international standards, ANSI for the front and ECE for the rear, meaning the bulbs from each position are not interchangeable with one another.