The International S2554 uses H6024 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 1981 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S2554 uses the H6024 bulb size across both the high beam and low beam headlight positions for the full 1981-1989 model year range covered by these specifications.
The H6024 is an ANSI-standardized sealed beam unit recognized in both the United States and Canada, operating at 12 volts.
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 component.
The H6024 format is a 7-inch round sealed beam, a form factor that was widely adopted across North American commercial and fleet vehicles of that era and is subject to ANSI dimensional standardization.
Because the International S2554 uses the same H6024 unit for both high and low beam positions, the two functions are served by a single sealed beam type rather than separate bulb sizes.
The ANSI standardization of the H6024 means that units produced by different manufacturers to that specification are generally interchangeable, provided they conform to the same standard.