The International R112 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 in the International R112 specifications.
The 198 is classified as an ANSI standard bulb recognized in both the United States and Canada.
It follows the T5 form factor, which refers to a miniature wedge-base construction without a separate metal base or pins, relying instead on the glass envelope itself to seat into the socket.
The 198 operates at 12 volts, consistent with the standard electrical system voltage found in most mid-20th century light-duty vehicles.
At 2 watts, the 198 is a low-output bulb, which is characteristic of indicator and signal applications rather than illumination functions.
The International R112 (1953-1955) carries the Light Duty designation across all listed front and rear turn signal positions, indicating these specifications apply to that specific variant of the vehicle.
The front and rear turn signals share the same 198 bulb specification across all three model years, meaning a single bulb type serves both positions on the vehicle.