The International L153 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1950 to 1952 vehicle 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 L153 uses the 198 bulb for both front and rear turn signals across the 1950-1952 model years, covering all listed Light Duty configurations.
The 198 is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a defined North American standard recognized in both the United States and Canada.
The 198 bulb follows the T5 miniature wedge form factor. A T5 designation refers to a tubular bulb with a width of 5/8 of an inch, fitted with a wedge-style base rather than a traditional bayonet or screw base.
The wedge base design means the 198 bulb is held in place by the socket itself, with no separate metal base crimped onto the glass envelope.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-wattage miniature bulbs used in automotive signaling applications of that era.
The identical bulb specification across both the front and rear turn signal positions on the International L153 means a single bulb type serves both locations without substitution or adaptation.
The Light Duty classification noted in the specifications refers to the vehicle trim or weight rating category within the L153 lineup, not a characteristic of the bulb itself.