The International L151 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1951 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 198 bulb is the sole bulb type listed across all turn signal positions for the International L151, covering both the 1951-1952 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to the American National Standards Institute's specifications for use in the United States and Canada.
It is classified as a miniature wedge bulb with a T5 designation, where "T5" refers to a tubular bulb shape with a width of 5/8 of an inch.
The wedge base design means the bulb is held in place by the socket gripping the glass envelope directly, with no separate metal base or pins involved.
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.
All entries in the specifications carry a "Light Duty" classification, which refers to the vehicle's weight and usage rating rather than the bulb's output.
The 198 bulb is shared between the front and rear turn signal positions on the International L151, indicating a single bulb type serves both functions on this vehicle.