International S2125 utilizes 168 bulb size for both front and rear side marker applications. Replacement chart data spans 1980 to 1981 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S2125 uses the 168 bulb across both front and rear side marker positions for the 1980-1981 model years.
The 168 bulb follows the ANSI standard recognized in both the United States and Canada, classifying it as a regulated miniature lamp type.
It is a T10 miniature wedge bulb, meaning it uses a wedge-style base rather than a bayonet or screw fitting, and seats directly into a compatible wedge socket without a separate metal base.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of side marker applications where continuous illumination is expected without significant electrical load.
Because the same 168 bulb size is specified for both the front and rear side marker positions on the International S2125, the front and rear sockets share the same bulb fitment requirement.