International S1925 front and rear side marker bulbs both utilize a 168 bulb size. 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 type specified for the International S1925 across all listed side marker positions and model years.
The 168 bulb follows the ANSI standard recognized in both the United States and Canada, classifying it as a regionally standardized automotive lighting component.
It is a miniature wedge bulb, designated by the T10 form factor, which refers to a tubular bulb body roughly 10 eighths of an inch wide with a wedge-style base that seats directly into a socket without a separate metal cap.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of marker and clearance lighting rather than primary illumination functions.
The International S1925 uses the same 168 bulb for both the front and rear side marker positions across the 1980-1982 model years, meaning a single bulb type serves all four side marker sockets on the vehicle.
The T10 wedge base format is a widely produced size, and numerous bulbs share this physical base style, though not all T10 wedge bulbs carry identical voltage or wattage ratings to the 168 specification.
When substituting bulbs, the physical fitment of a T10 wedge base alone does not confirm electrical compatibility, as wattage differences can affect socket heat tolerance and circuit load.