The International S2524 uses 168 bulb size for both front and rear side marker applications. The replacement chart covers 1980 to 1982 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 168 bulb is the sole bulb size specified for the International S2524 across all listed model years and positions, covering both front and rear side marker applications from 1980-1982.
The 168 is classified as a miniature wedge bulb, designated T10 in the ANSI standard system used in the United States and Canada.
The T10 designation refers to the bulb's tubular envelope shape, with the numeric portion indicating the width in eighths of an inch.
The 168 operates at 12 volts, which is consistent with standard automotive electrical systems of that era.
At 4.9 watts, the 168 is a low-wattage bulb, typical of side marker applications where illumination intensity requirements are lower than those of primary lighting functions such as headlamps or brake lights.
The wedge base design of the 168 means the bulb is held in its socket by the tension of the base itself rather than by a bayonet or screw mechanism, which was a common fitment method for marker and courtesy lighting in vehicles of this period.
The 168 and the closely related 194 bulb share the same T10 wedge base and are frequently referenced together in fitment contexts; however, the 194 draws 3.78 watts compared to the 168's 4.9 watts, making them not fully interchangeable in all applications despite their physical similarity.
The ANSI standardization of the 168 bulb means it was produced by multiple manufacturers to a common specification, ensuring consistent electrical and physical characteristics across sources.