International S112 headlight bulbs utilize the H6024 bulb size for both high beam and low beam applications. The replacement chart covers 1956 to 1957 model 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 non-serviceable assembly. When the filament fails, the whole unit is replaced rather than an internal bulb.
The International S1112 uses the H6024 for both the high beam and low beam headlight positions across the 1956-1957 model years, making it the sole bulb type present in these specifications.
Because the H6024 is a sealed beam rather than a bulb-and-socket design, fitment is determined by the physical size and mounting configuration of the unit itself. The 7-inch round format was a widely standardized size in mid-20th century North American vehicle production, which means compatible replacements are generally available from multiple manufacturers producing units to the same ANSI specification.
The shared H6024 fitment across both the high beam and low beam positions indicates the International S1112 used a dual-headlamp arrangement where each sealed beam unit handled a single function, as opposed to a single unit containing both filaments.