Buick Regal Sportback Turn Signal Bulb Size

The Buick Regal Sportback rear turn signal bulb uses a 12496 size replacement bulb. The chart covers 2018 to 2020 production 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.

Rear Turn Signal

Years	Bulb Size
2018-2020	12496

Bulb Specifications

Description	Bulb Size
Philips/Osram part number. Halogen bulb, specialty application. 12V.	12496

Other Locations

Additional Notes

The 12496 is the rear turn signal bulb size for the Buick Regal Sportback across the 2018-2020 model years.
The 12496 designation originates from Philips and Osram, two major automotive lighting manufacturers that use this shared part number for the same bulb.
The 12496 is a halogen bulb, meaning it uses a tungsten filament enclosed within a halogen gas environment, which extends filament life and maintains luminous output compared to standard incandescent bulbs.
The 12496 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
The 12496 is classified as a specialty application bulb, indicating it is not a common universal fitment and is intended for specific vehicle positions rather than general-purpose use.