The International R110 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers vehicle production spanning 1953 to 1955.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 198 bulb is the sole bulb type listed across all turn signal positions on the International R110, appearing in both front and rear applications for the 1953-1955 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification used across the United States and Canada.
This bulb is classified as a miniature wedge type in the T5 form factor, which refers to a tubular bulb roughly 5/8 of an inch wide that uses a wedge-shaped base rather than a metal screw or bayonet fitting.
The 198 bulb operates at 12 volts and draws 2 watts, placing it at the low end of the power consumption range for automotive signal lighting.
The wedge base design of the 198 bulb means it is held in its socket by the tension of the socket walls rather than by a locking mechanism, which is a fitment characteristic relevant to replacement.
The Light Duty designation applies uniformly to all listed model years and both signal positions on the International R110, indicating no variation in bulb specification between front and rear turn signal circuits for this vehicle.