The International L121 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers vehicle production spanning 1950 to 1952.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The bulb type 198 is the sole bulb specified across all turn signal positions on the International L121, covering model years 1950-1952.
The 198 bulb follows the ANSI standard, meaning it conforms to the American National Standards Institute's established specifications for automotive lighting, applicable in both the United States and Canada.
The 198 bulb uses a miniature wedge base, classified under the T5 designation, which refers to a tubular bulb with a 5/8-inch width.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs used in automotive applications.
The International L121 (1950-1952) uses the same 198 bulb for both the front and rear turn signals, indicating a uniform fitment across all four turn signal positions on the vehicle.
The Light Duty classification noted in the specifications applies consistently to all listed model years and both front and rear positions, indicating no variation in duty rating across the turn signal circuit.