International L112 front and rear turn signal bulbs both utilize a 198 bulb size. 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 International L112 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 in the T5 form factor, meaning it uses a wedge-style base rather than a bayonet or screw mount, and fits into a corresponding wedge socket without a separate metal base.
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 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.
Because the same bulb number applies to both the front and rear turn signal positions on the International L112, a single bulb type serves all four turn signal sockets on the vehicle.
The T5 designation refers to the tubular envelope width of the bulb, expressed in eighths of an inch, making the glass envelope approximately 5/8 of an inch wide.
The Light Duty classification noted in the specifications corresponds to the vehicle's weight or usage rating rather than a characteristic of the bulb itself.