Chevrolet Chevelle headlight bulb sizes include H6024 and H5001 for high beam applications, with H6024 and H5006 available for low beam configurations in this bulb replacement chart. The chart documents specifications across the 1964 to 1973 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Chevelle uses three distinct sealed beam unit types across its headlight specifications: H6024, H5001, and H5006. All three conform to ANSI standards recognized in both the United States and Canada, and all operate at 12 volts.
Sealed beam units integrate the filament, reflector, and lens into a single assembly. When a sealed beam fails, the entire unit requires replacement rather than just an internal bulb.
The H6024 is a 7-inch round sealed beam unit. It serves as both the high beam and low beam headlight for the 1971-1973 Chevelle, meaning a single unit type covers both functions across those years.
The H5001 is a 4-inch square sealed beam unit designated for the high beam headlight position on the 1964-1970 Chevelle. Its square form factor distinguishes it physically from the round units used in other positions.
The H5006 is a 5.75-inch round sealed beam unit assigned to the low beam headlight position on the 1964-1970 Chevelle. Although it shares a round form with the H6024, the two units are not the same size and are not interchangeable.
For the 1964-1970 Chevelle, the high beam and low beam headlight positions require different sealed beam units, H5001 and H5006 respectively. Substituting one for the other would result in an incorrect fitment.
The transition from the H5001 and H5006 pairing to the H6024 for both beam positions occurred between the 1970 and 1971 model years on the Chevelle.
The H6024 used on the 1971-1973 Chevelle is physically larger than both the H5001 and H5006 units used in prior years, which reflects a difference in housing requirements between the two generations of headlight assemblies.