The International 1110 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers vehicle production spanning 1971 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 front and rear turn signal positions for the International 1110 across the 1971-1973 model years.
The 198 is classified as a miniature wedge bulb with a T5 envelope, meaning it uses a wedge-style base rather than a bayonet or screw fitting, and the T5 designation refers to a tubular glass envelope approximately 5/8 inch wide.
The 198 operates at 12 volts and draws 2 watts, placing it at the low end of the power range for automotive signal bulbs.
The 198 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification shared across North American markets.
For the 1971 and 1972 model years, the 198 bulb size is designated specifically for the Light Duty configuration of the International 1110, indicating that this specification applies within that particular vehicle classification.
The 1973 model year carries no duty-class qualifier for either the front or rear turn signal position, while the 1971 and 1972 entries are restricted to the Light Duty designation.
Because both the front and rear turn signal positions share the same 198 bulb specification across all listed years, the same bulb type serves both signal locations on the International 1110.