International S2554 front side marker bulbs use 168 or 1895 bulb sizes, while rear side marker bulbs use 168 size. The replacement chart covers vehicle production years from 1981 to 1989 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 bulb type 168 is the most frequently specified across the International S2554 side marker positions. It is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12 volts and 4.9 watts, and recognized under US and Canadian standards.
The bulb type 1895 is an ANSI-standard miniature wedge bulb in the T5 form factor, rated at 12 volts and 0.9 watts. The T5 form factor is physically smaller than the T10, and the two types are not interchangeable despite both using a wedge base design.
The rear side marker position on the International S2554 uses the 168 bulb uniformly across all model years from 1981-1989.
The front side marker position on the International S2554 uses the 168 bulb for most of its model year range, with the 1895 specified for 1985 and 1987 as exceptions.
Because the front side marker alternates between the 168 and 1895 in certain years, year-specific verification is relevant before sourcing a replacement for the front position on this vehicle.
The wattage difference between the 168 (4.9W) and the 1895 (0.9W) is substantial, reflecting a meaningful difference in light output between the two bulb types used in the front side marker positions.