The Jeep FC170 high beam and low beam headlight bulbs utilize H6024 and H6006 bulb sizes for optimal illumination. The replacement chart covers vehicle production spanning 1957 to 1966 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6024 and H6006 are both sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. When the filament fails, the entire unit requires replacement rather than just the bulb element.
The H6024 is a 7-inch round sealed beam unit operating at 12V, conforming to ANSI standards recognized in both the United States and Canada.
The H6006 is a 5x7-inch rectangular sealed beam unit, also rated at 12V and built to the same ANSI standard applicable in the United States and Canada.
The Jeep FC170 used the H6006 rectangular sealed beam for both high and low beam functions in the 1957 model year.
By 1966, the FC170 transitioned to the H6024 round sealed beam for both high and low beam positions, a physically distinct unit from the H6006 used in 1957.
Because the H6024 is round and the H6006 is rectangular, the two units are not interchangeable. Housing geometry differs between the two formats, making cross-year substitution incompatible.
Both the 1957 and 1966 FC170 specifications share the same bulb size across high beam and low beam positions within each respective year, indicating a single sealed beam type served dual functions per model year.