The International SA120 uses a 198 bulb size for both front and rear turn signal applications. This replacement chart covers vehicle production spanning 1956 to 1957.
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 SA120, appearing in both the front and rear turn signal applications for 1956-1957.
The 198 bulb follows the ANSI standard recognized in the United States and Canada, classifying it as a miniature wedge type in the T5 form factor.
A T5 wedge bulb uses a wedge-shaped base in place of a traditional metal contact, relying on the socket's tension to maintain the electrical connection.
The 198 bulb operates at 12 volts with a rated output of 2 watts, placing it at the low end of the power range for automotive signal lighting.
All entries across both model years carry a Light Duty designation, which reflects the vehicle's weight class classification rather than a bulb-specific rating.
Because the same bulb size is specified for both the front and rear turn signals, the 198 bulb is interchangeable between those two positions on the International SA120 for 1956-1957.