International S1654LP front and rear side marker bulbs utilize a 168 bulb size for replacement applications. The replacement chart covers vehicle production spanning 1988 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S1654LP uses the 168 bulb across both front and rear side marker positions for the 1988-1989 model years.
The 168 is an ANSI-standardized bulb recognized in both the United States and Canada, operating at 12 volts with a power draw of 4.9 watts.
The 168 bulb follows the T10 miniature wedge form factor, a designation that refers to a tubular bulb approximately 10 millimeters wide with a wedge-style base that seats directly into a socket without a separate metal cap.
The wedge base design of the T10 means the bulb is held in place by the tension of the socket contacts rather than by a bayonet or screw mechanism, which is a common trait in low-wattage automotive marker and interior lighting applications.
Because the same 168 bulb size applies to all four side marker positions on the International S1654LP, front and rear sockets accept the same replacement unit without substitution.