International S1753 front and rear side marker bulbs both utilize a 168 bulb size. The replacement chart covers vehicle production spanning 1984 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S1753 uses the 168 bulb for both front and rear side marker positions across the 1984-1989 model years.
The 168 is a miniature wedge bulb built to the T10 form factor, which refers to a tubular glass envelope roughly 10 eighths of an inch wide with a wedge-style base that requires no socket pins.
The 168 operates at 12 volts with a power draw of 4.9 watts, placing it in the low-wattage range typical of marker and clearance lighting applications.
The 168 conforms to ANSI standards recognized in both the United States and Canada, meaning it meets a defined set of electrical and physical tolerances rather than being a proprietary specification.
Because the front and rear side marker positions on the International S1753 share the same bulb size, a single bulb type services all four marker sockets on the vehicle.
The wedge base of the 168 is retained in its socket by friction rather than by a bayonet twist or screw mechanism, which is a characteristic of the T10 wedge format.