The Buick Regal Sportback uses H7 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 2018 to 2020 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 H7 bulb is specified for both the high beam and low beam headlight positions across all listed model years (2018-2020) of the Buick Regal Sportback, but only when the vehicle is equipped with halogen capsule headlamps.
The H7 is a single-filament halogen bulb, meaning it serves one lighting function per unit. Because both the high beam and low beam positions share this same bulb type, the Regal Sportback's halogen headlamp system uses separate H7 bulbs for each function rather than a dual-filament alternative.
The H7 bulb operates at 12 volts and 55 watts, which are standard ratings for halogen headlamp applications in passenger vehicles.
The H7 uses a PX26d base, a two-pin connector with a specific locking collar. This base type is not interchangeable with other common headlamp bases such as H4 or H11, and substitution with a physically similar but differently keyed bulb would result in an improper fit.
The H7 is an ECE-standard bulb, meaning it was developed under European regulations and is also approved for use in the United States and Japan, reflecting its broad regulatory acceptance across major automotive markets.
The halogen capsule headlamp condition noted in each specification row indicates that the Buick Regal Sportback (2018-2020) was available with an alternative headlamp system, and the H7 fitment applies exclusively to the halogen variant.