International S2155 front and rear side marker bulbs both utilize a 168 bulb size. The replacement chart covers vehicle production spanning 1984 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S2155 uses the 168 bulb for both front and rear side marker positions across the 1984-1989 model years.
The 168 is a miniature wedge bulb built to the T10 form factor, which refers to a tubular glass envelope roughly 10 eighths of an inch wide with a wedge-style base that requires no socket pins.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of marker and clearance lighting applications.
The 168 bulb carries ANSI standardization recognized in both the United States and Canada, meaning units sourced from either market share the same electrical and physical specifications.
Because the International S2155 uses the same 168 bulb in all four side marker positions, a single bulb type services the entire side marker system on the vehicle.
The wedge base design of the 168 is retained by friction within the socket rather than by a bayonet or screw mechanism, which is a characteristic of the T10 wedge format.