International C1300 front and rear turn signal bulbs use a 198 size bulb for both locations. The replacement chart covers vehicle production spanning 1963 to 1964.
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 C1300, covering both the 1963-1964 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification used in both 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 seats directly into a socket without a separate metal base or pins.
The 198 bulb operates at 12 volts and draws 2 watts, placing it at the low end of the power range for automotive signal lighting.
The Light Duty designation applies to all listed entries for the International C1300, indicating these specifications correspond to the light-duty variant of the vehicle rather than a heavier commercial configuration.
The 198 bulb is used in both the front and rear turn signal positions on the International C1300, meaning both locations share an identical bulb type across the listed model years.
The wedge base design of the 198 bulb is not interchangeable with bayonet-style or indexed-pin bulb sockets, as the retention method relies entirely on the tapered plastic wedge fitting into a matching socket cavity.