Volvo 264 Headlight Bulb Size

Additional Notes

• The Volvo 264 headlight specifications reference two sealed beam form factors across its model years: rectangular 4x6-inch units and a 4-inch square unit for high beam positions, alongside rectangular 4x6-inch and 5.75-inch round units for low beam positions.
• All five bulb types listed in these specifications, H4651, H5001, H4656, H4652, and H5006, are sealed beam units operating at 12V and conforming to ANSI standards recognized in the United States and Canada.
• Sealed beam units are self-contained assemblies in which the filament, reflector, and lens are fused into a single glass envelope. When a filament fails, the entire unit requires replacement rather than an individual bulb.
• The H4652 low beam unit is described as a variant of the H4651 high beam unit, both sharing the 4x6-inch rectangular sealed beam format. Despite their physical similarity, the two serve distinct beam functions and are not interchangeable between high and low beam positions.
• The Volvo 264 used different high beam bulb types depending on the model year. The H4651 rectangular unit was specified for 1978-1979 and 1981-1982, while the H5001 square unit was specified for 1976-1977 and 1980.
• Low beam specifications across the 264's model years show three distinct bulb types in use: the H5006 round unit for 1976-1977 and 1980, the H4652 rectangular unit for 1978 and 1981, and the H4656 rectangular unit for 1979 and 1982.
• The 5.75-inch round H5006 sealed beam format is physically distinct from the 4x6-inch rectangular units. The two formats are not interchangeable, and housing design on the vehicle corresponds to the specific form factor required for each model year.
• Because high beam and low beam positions in the 264 used different sealed beam types within the same model year, each position carries its own fitment requirement and the units across positions are not substitutable for one another.