The International MS1210 uses a 198 bulb size for both front and rear turn signal applications. This replacement chart covers vehicle production spanning 1972 to 1973.
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 MS1210, covering both the 1972-1973 model years.
The 198 bulb follows the ANSI standard recognized in both the United States and Canada, classifying it as a miniature wedge type with a T5 form factor.
T5 refers to the tubular glass envelope width, which in this case measures five-eighths of an inch, a common sizing convention in miniature automotive bulbs.
The 198 bulb operates at 12 volts and draws 2 watts, placing it in the low-wattage range typical of indicator and signal lighting rather than illumination lighting.
The Light Duty designation applies to all listed front and rear turn signal positions for both model years, indicating the vehicle trim or weight class these fitments correspond to.
The 198 bulb serves both the front and rear turn signal positions on the International MS1210, meaning a single bulb type covers all four signal locations on the vehicle.
The miniature wedge base of the 198 bulb is a tool-free, push-in design that seats directly into a wedge-type socket without a separate metal base, which is a relevant factor in socket compatibility.
Substituting a bulb with a higher wattage rating than the specified 2 watts risks exceeding the thermal and electrical tolerances of the original socket and wiring harness.