The International C100 uses a 198 bulb size for both front and rear turn signal applications. This replacement chart covers 1961 to 1962 vehicle production years.
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 for the International C100, covering both the 1961-1962 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to a standardized specification recognized across the United States and Canada.
It is classified as a miniature wedge bulb in the T5 form factor, which refers to a tubular glass envelope approximately 5/8 of an inch wide with a wedge-style base that requires no separate socket pins.
The 198 bulb operates at 12 volts and draws 2 watts, placing it in the very low wattage range typical of indicator and signal lighting rather than primary illumination.
The Light Duty designation applies to all listed fitments for the International C100, indicating these specifications correspond to the lighter vehicle configuration rather than a heavier commercial variant.
The 198 bulb serves both the front and rear turn signal positions on the International C100 for 1961-1962, meaning the same bulb type is shared across all four turn signal locations on the vehicle.