The International B110 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1959 to 1960 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 turn signal bulb type listed for the International B110, appearing in both front and rear turn signal positions across the 1959-1960 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification used in both the United States and Canada.
It is a miniature wedge-type bulb, classified under the T5 designation, which refers to a tubular envelope roughly 5/8 of an inch wide.
The wedge base design means the bulb is held in place by the socket itself rather than by a separate metal base with pins, a common trait in low-wattage automotive applications.
The 198 bulb operates at 12 volts, consistent with the 12-volt electrical systems standard in automotive use during this period.
At 2 watts, the 198 is a very low-output bulb, reflecting its role as a signal indicator rather than a primary lighting source.
The specifications designate the B110 entries under a Light Duty classification, which distinguishes this vehicle from heavier-duty variants that may use different bulb fitments.
The identical bulb size across both front and rear turn signal positions on the International B110 indicates full interchangeability between those two applications for the 1959-1960 model years.