The Nissan 521 Pickup uses an H5001 bulb size for high beam headlights and an H5006 bulb size for low beam headlights. The replacement chart covers vehicle production years from 1968 to 1972 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 521 Pickup uses the H5001 bulb for high beam headlights across all model years from 1968-1972.
The H5001 is a 4-inch square sealed beam unit operating at 12V, conforming to ANSI standards for the US and Canadian markets. The entire unit is replaced rather than an internal bulb.
Low beam headlights on the 521 Pickup are fitted with the H5006 across the same 1968-1972 model year span.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and built to ANSI standards for the US and Canadian markets. Like the H5001, the full unit is replaced upon failure.
The H5001 and H5006 are physically distinct units. The square format of the H5001 and the round format of the H5006 make the two types non-interchangeable between the high and low beam positions.