The International 1010 front and rear turn signal bulbs both require a 198 size bulb for proper operation. 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 1010, covering model years 1971-1973.
The 198 bulb follows the ANSI standard, meaning it conforms to the American National Standards Institute's established specifications for miniature automotive lighting, applicable in both the United States and Canada.
It is a T5 miniature wedge bulb, where "T5" denotes a tubular envelope with a 5/8-inch width, and the wedge base type means the bulb is held in its socket by the glass envelope itself rather than a separate metal base.
The 198 operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs in automotive applications, consistent with small indicator and signal functions.
The 1971 and 1972 entries carry a "Light Duty" designation for both front and rear turn signal positions, while the 1973 entries carry no such qualifier.
The wedge base format of the 198 bulb is not interchangeable with bayonet or screw-base socket types, as the retention mechanism differs fundamentally between these base designs.