International B122 vehicles utilized H6024 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1959 to 1960 production years 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 is a 7-inch round sealed beam unit operating at 12 volts. It follows the ANSI standard used in the United States and Canada, meaning the entire housing, lens, and filament are fused into a single assembly. When the filament fails, the whole unit is replaced rather than an individual bulb.
The International B122 uses the H6024 for both the high beam and low beam headlight positions across the 1959-1960 model years, with no variation between those functions or those years.
Because the H6024 is a sealed beam unit, it is not compatible with retrofit bulb-only replacements without additional modification to the housing. The sealed beam format was a regulated standard, which means H6024 units from different manufacturers are physically interchangeable as long as they conform to the ANSI specification.