The Mack RW headlight bulb size chart specifies high beam and low beam bulb options including H6024, H4651, H5001, H4652, and H5006 sizes for this vehicle model. The replacement chart covers 1985 to 1993 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 Mack RW uses sealed beam headlight units across all three headlamp configurations available from 1985-1993. Sealed beam units integrate the filament, reflector, and lens into a single housing, meaning the entire unit is replaced rather than an individual bulb.
All sealed beam types specified for the Mack RW operate at 12V and conform to ANSI standards recognized in both the United States and Canada.
The H6024 is a 7-inch round sealed beam unit serving as both the high beam and low beam source on 2-round-headlamp configurations. Its dual-function role across both beam positions is consistent throughout the full 1985-1993 model range.
The 4-round-headlamp configuration uses two distinct sealed beam types: the H5001 for high beam and the H5006 for low beam. The H5001 is a 4-inch square unit, while the H5006 is a 5.75-inch round unit, making these two physically non-interchangeable despite serving the same vehicle configuration.
The 4-rectangular-headlamp configuration uses 4x6-inch sealed beam units for both high and low beam positions, though the specific type varies by function and model year. The H4651 covers the high beam position for all years from 1985-1993.
The low beam position on 4-rectangular-headlamp configurations is covered by either the H4652 or the H4656 depending on the model year. The H4656 applies to 1988-1991, while the H4652 applies to 1985-1987 and 1992-1993.
The H4652 is classified as a variant of the H4651, both being 4x6-inch rectangular sealed beam units. Despite their physical similarity, they are designated for different beam functions and are not listed as interchangeable within these specifications.
The H4651, H4652, and H4656 all share the same 4x6-inch rectangular form factor. Substituting one for another without confirming the correct beam designation risks incorrect light output orientation or intensity for the intended position.