The International 1100D headlight bulb uses an H6024 size for both high and low beam functions. The replacement chart covers 1969 to 1970 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 conforms to ANSI standards applicable in the United States and Canada. Unlike bulb-and-housing systems, the sealed beam design integrates the filament, reflector, and lens into a single unit, meaning the entire assembly is replaced rather than an internal bulb.
The International 1100D uses the H6024 for both the high beam and low beam headlight positions across the 1969-1970 model years. A single bulb type serving both functions is characteristic of older sealed beam systems that used a dual-filament design within one unit.
Because the H6024 is a sealed beam unit rather than a socketed bulb, fitment is determined by the physical size and mounting configuration of the unit itself. The 7-inch round format was a standardized size, which generally allowed interchangeability across vehicles specifying the same sealed beam type.