The International C122 uses H6024 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1961 to 1962 vehicle 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. Unlike bulb-based housings, the sealed beam design integrates the filament, reflector, and lens into a single unit, meaning the entire assembly is replaced rather than an individual bulb.
The International C122 uses the H6024 for both high beam and low beam headlight positions across the 1961-1962 model years. A single bulb type serving both functions in this way is characteristic of early sealed beam systems, where a dual-filament design within one unit handles both lighting modes.
Because the H6024 is a sealed beam unit rather than a socketed bulb, standard bulb interchangeability considerations do not apply in the conventional sense. Replacement requires sourcing a compatible sealed beam unit that matches the 7-inch round form factor and ANSI specification.