The International C102 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1961 to 1962 model 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 International C102 uses the 198 bulb for both front and rear turn signals across the 1961-1962 model years.
The 198 is an ANSI-standardized bulb type, meaning its specifications conform to a defined North American standard recognized in both the United States and Canada.
The 198 bulb follows a T5 miniature wedge form factor, which refers to a wedge-base construction measuring 5/8 of an inch in its widest tubular section.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-output signal bulbs in automotive applications.
The Light Duty designation associated with the 198 bulb entries reflects the vehicle trim or weight classification for which these fitments apply on the C102.
Because the same bulb size is specified for both the front and rear turn signal positions, a single bulb type serves all four turn signal sockets on the C102 for the listed model years.
The wedge base of the 198 bulb is not interchangeable with bayonet-base or screw-base bulb types, even when voltage and wattage ratings are otherwise similar.