The White/GMC WXR high beam and low beam headlight bulb size specifications include 9004 and H6024 options. The replacement chart covers 1993 to 1995 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 White/GMC WXR used two distinct headlamp system types across the 1993-1995 model years, with bulb selection determined entirely by which system was installed on the vehicle.
The 9004 is a dual-filament halogen bulb operating at 12V with a P29t base, rated at 65W on the high beam filament and 45W on the low beam filament, and it meets ANSI standards for use in the United States and Canada.
Because the 9004 contains both high and low beam filaments within a single housing, it serves both the high beam and low beam functions in composite headlamp-equipped WXR vehicles.
The H6024 is a 7-inch round sealed beam unit rated at 12V and conforming to ANSI standards for the United States and Canada. The entire unit constitutes the light source, meaning no separate replaceable bulb exists within it.
Vehicles fitted with sealed beam headlamps require full unit replacement rather than bulb replacement, which distinguishes them from composite headlamp vehicles where only the 9004 bulb is exchanged.
The two headlamp systems are not interchangeable at the bulb level. A vehicle with composite headlamps takes a 9004 bulb, while a vehicle with sealed beam headlamps requires an H6024 unit, and the two types are incompatible with each other's housings.