The Mazda RX-2 headlight bulb specifications include an H5001 size for high beam and H5006 size for low beam applications. The replacement chart covers 1973 to 1974 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda RX-2 uses two distinct sealed beam types across its headlight system: the H5001 for high beam and the H5006 for low beam, both conforming to ANSI standards applicable in the US and Canada.
The H5001 is a 4-inch square sealed beam unit operating at 12V. Because it is a sealed beam, the lens, reflector, and filament form a single assembly, meaning the entire unit is replaced rather than an internal bulb.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and sharing the same sealed construction as the H5001, requiring full unit replacement when the filament fails.
Both the H5001 and H5006 are ANSI-standardized units, which means their physical and electrical specifications are governed by a defined industry standard rather than being proprietary to Mazda.
The square format of the H5001 and the round format of the H5006 are not interchangeable. The differing shapes and housing geometries make cross-substitution between the two types physically incompatible.
Both bulb types apply uniformly across the 1973-1974 model years of the RX-2, with no variation in specification between those years for either the high beam or low beam position.