The International S1853FC headlight bulb uses H6024 size for both high beam and low beam applications. The replacement chart covers vehicle production spanning 1987 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6024 is an ANSI-standard sealed beam unit used in both the high beam and low beam headlight positions of the International S1853FC across the 1987-1989 model years.
A sealed beam unit integrates the filament, reflector, and lens into a single non-serviceable assembly, meaning the entire unit is replaced rather than an internal bulb.
The H6024 follows a 7-inch round form factor, a configuration standardized under ANSI specifications and recognized across both the United States and Canada.
The H6024 operates at 12 volts, consistent with the standard electrical systems found in commercial vehicles of this type.
Because the International S1853FC uses the same H6024 unit for both high and low beam functions, the vehicle relies on a dual-filament sealed beam design rather than separate housings for each beam mode.
The H6024 designation is an interchangeable ANSI-coded type, meaning units from different manufacturers carrying the same code share identical optical and electrical specifications.