Chevrolet Chevette headlight bulbs utilize H6054 and H6024 sizes for both high and low beam applications, with bulb specifications varying across the vehicle's production range. The replacement chart documents bulb size data spanning 1976 through 1987.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6054 and H6024 are both sealed beam headlight units, meaning the lens, reflector, and filament are fused into a single assembly. When a filament fails, the entire unit requires replacement rather than an internal bulb.
Both sealed beam types operate on a 12V electrical system and conform to ANSI standards recognized in the United States and Canada.
The H6054 is a 5x7-inch rectangular sealed beam unit. The Chevrolet Chevette used this type for both high beam and low beam functions across the 1979-1987 model years.
The H6024 is a 7-inch round sealed beam unit, used on the Chevette for both high beam and low beam positions during the 1976-1978 model years.
Because the H6054 and H6024 differ in shape and physical size, the two types are not interchangeable with each other.
The H6054 serves a dual-function role on the Chevette, covering both the high beam and low beam positions within a single unit, which is a characteristic of certain rectangular sealed beam designs.
The shift from the round H6024 to the rectangular H6054 occurred between the 1978 and 1979 model years, representing a change in headlight housing geometry that affects physical fitment.