International R111 vehicles used 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1953 to 1955 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 in the International R111 specifications, appearing in both front and rear applications for the 1953-1955 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to the American National Standards Institute's established criteria for electrical and photometric performance, applicable in both the United States and Canada.
The 198 bulb is classified as a miniature wedge type in the T5 envelope, which refers to a tubular glass envelope roughly 5/8 of an inch wide, fitted with a wedge-shaped plastic base that seats directly into a socket without a separate metal cap.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-output bulbs in automotive use, consistent with indicator rather than illumination functions.
The Light Duty designation present in each specification row indicates these fitments apply specifically to the light duty variant of the International R111 rather than to heavier configurations.
Because the same bulb number is specified for both the front and rear turn signals across all listed years, the 198 bulb is interchangeable between those two positions on the International R111 (1953-1955) without modification.