The Buick Reatta high beam and low beam headlight bulbs both utilize the H6054 size. The replacement chart covers vehicle production spanning 1988 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Reatta uses the H6054 bulb size for both high beam and low beam headlights across all model years from 1988-1991.
The H6054 is a 5x7-inch rectangular sealed beam unit, meaning the lens, reflector, and filament are fused into a single assembly rather than a separate bulb inside a housing.
Because the H6054 is a sealed beam design, the entire unit is replaced when the light fails, not an individual bulb.
The H6054 operates at 12 volts and conforms to ANSI standards recognized in both the United States and Canada.
Since the Buick Reatta (1988-1991) uses the same H6054 unit for both high and low beam functions, a single sealed beam assembly serves dual lighting roles rather than relying on separate dedicated units for each function.
The rectangular form factor of the H6054 is a fixed physical standard, so only units matching the 5x7-inch rectangular specification are compatible with the Reatta's headlight housing.