The International L122 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1950 to 1952 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 L122 uses the 198 bulb for both front and rear turn signals across the 1950-1952 model years.
The 198 is classified as a miniature wedge bulb with a T5 envelope, meaning it uses a wedge-style base rather than a bayonet or screw fitting, and the glass envelope is approximately 5/8 of an inch wide.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-output bulbs in automotive applications.
The 198 carries ANSI standardization recognized in both the United States and Canada, indicating it conforms to a defined set of electrical and physical tolerances shared across those markets.
The Light Duty designation in the specifications applies to all listed model years for both the front and rear turn signal positions on the International L122.
Because the same bulb number is specified for both the front and rear turn signal positions, the 198 is interchangeable between those two locations on this vehicle.