The Nissan 510 uses H4651 and H5001 bulb sizes for high beam headlights and H4656 and H5006 bulb sizes for low beam headlights. The replacement chart covers 1968 to 1981 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 510 uses two distinct sealed beam form factors across its model years: a 4-inch square unit and a 4x6-inch rectangular unit, depending on the year and beam function.
All four bulb types specified for the Nissan 510 are ANSI-standardized sealed beam units rated at 12V, meaning the entire housing, lens, and filament assembly is replaced as one piece rather than as an individual bulb.
The H5001 and H5006 are the high beam and low beam units, respectively, for the 1968-1973 and 1978-1979 model years. The H5001 is a 4-inch square sealed beam, while the H5006 is a 5.75-inch round sealed beam.
The 1980-1981 model years use a different pairing: the H4651 for high beam and the H4656 for low beam, both of which are 4x6-inch rectangular sealed beam units.
Because the high beam and low beam units differ in physical form between the square/round configuration and the rectangular configuration, the two generational pairings are not interchangeable with one another.
The H5001 and H4651 share the same 4x6-inch or 4-inch square ANSI classifications but serve different beam functions, so substituting one for the other within the same vehicle would be incorrect.
The ANSI standardization of all four units means physically compatible replacements from multiple manufacturers are generally available, provided the correct ANSI designation is matched.