The International R122 front and rear turn signal bulbs both utilize a 198 size bulb specification. 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 International R122 uses the 198 bulb across both its front and rear turn signal positions for the 1953-1955 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 form factor, which refers to a miniature wedge-base construction. This base type requires no separate socket retainer, as the wedge itself holds the bulb in place through friction.
The 198 operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs used in automotive signaling applications.
Because the International R122 uses the same 198 bulb for both front and rear turn signals across all listed model years, a single bulb type serves all four turn signal positions on the vehicle.