The International S1954 front side marker uses 168 or 1895 bulb sizes, while the rear side marker requires a 168 bulb size. The replacement chart covers 1981 to 1990 vehicle 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 168 bulb is the dominant fitment across the International S1954, appearing in both the front and rear side marker positions for model years 1981-1990, with a single exception in the front side marker position for 1989.
The 168 bulb is an ANSI-standard miniature wedge type with a T10 envelope, rated at 12V and 4.9W, placing it in the low-wattage category typical of side marker and parking light applications.
The 1895 bulb, fitted to the 1989 International S1954 front side marker, is also an ANSI-standard miniature wedge type, but uses a smaller T5 envelope and draws only 0.9W at 12V, making it significantly lower in wattage than the 168.
Because the 168 and 1895 are both miniature wedge bulbs, their physical bases share the same wedge-style connection method, but the difference in envelope size between T10 and T5 means the two types are not interchangeable without confirming socket fitment.
The rear side marker position on the International S1954 uses the 168 bulb without exception across all listed model years from 1981-1990.
The wattage difference between the 168 (4.9W) and the 1895 (0.9W) is substantial enough that substituting one for the other could affect circuit load and visible light output in the affected position.