Nissan 810 high beam headlight bulbs use H4651 or H5001 size, while low beam headlight bulbs use H4652, H4656, or H5006 size. The replacement chart covers 1977 through 1981 vehicle production years 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 Nissan 810 uses sealed beam headlight units across all listed model years, meaning the entire lens-reflector-filament assembly is replaced as one unit rather than replacing an internal bulb separately.
All sealed beam types specified for the Nissan 810 conform to ANSI standards recognized in both the United States and Canada, and all operate on a 12V electrical system.
The H4651 and H4652 are both 4x6-inch rectangular sealed beam units, with the H4652 classified as a variant of the H4651. The H4651 serves the high beam function while the H4652 serves the low beam function, making the two non-interchangeable despite their close physical relationship.
The 1979-1981 high beam position uses the H4651, a 4x6-inch rectangular sealed beam unit, while the 1977-1978 model years use the H5001, a 4-inch square sealed beam unit. These two formats are physically distinct and not interchangeable.
The low beam specification changes across three different units depending on the model year: the H5006 (5.75-inch round) for 1977-1978, the H4656 (4x6-inch rectangular) for 1979, and the H4652 (4x6-inch rectangular, H4651 variant) for 1980-1981.
The 1978 model year uses a mixed headlight format, pairing the 4-inch square H5001 for high beam with the 5.75-inch round H5006 for low beam, indicating that the high and low beam positions used physically different sealed beam shapes in that configuration.
The H5006 is a 5.75-inch round sealed beam unit, a format that differs substantially in shape from the rectangular units used in later years, meaning round and rectangular sealed beams occupy different housing geometries and are not substitutable for one another.