The International A110 uses a 198 bulb size for both front and rear turn signal applications. This replacement chart covers vehicle production spanning 1957 to 1958.
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 turn signal bulb size listed for the International A110, appearing in both front and rear turn signal positions across the 1957-1958 model years.
The 198 bulb follows ANSI standards recognized in the United States and Canada, placing it within a regulated specification framework common to North American automotive lighting.
The 198 is a miniature wedge-type bulb, classified under the T5 designation. The T5 designation refers to a tubular bulb with a width of 5/8 of an inch, a standard sizing convention in the miniature bulb category.
The 198 bulb operates at 12 volts and draws 2 watts, reflecting a low-power design typical of indicator and signal lighting rather than illumination-focused applications.
The wedge base of the 198 bulb means it is held in its socket by the tension of the socket walls rather than by a bayonet or screw mechanism, a fitment characteristic that affects socket compatibility.
Because the same bulb size is specified for both the front and rear turn signal positions on the International A110, a single bulb type serves all four turn signal sockets on the vehicle across both listed model years.
The Light Duty classification noted alongside the 198 bulb size indicates the vehicle trim or configuration to which these specifications apply, distinguishing it from any heavier-duty variants that may use different components.