International R111 side marker bulbs utilize 194 size for front positions and 97 size for rear positions. The replacement chart covers 1953 to 1955 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International R111 uses two distinct bulb types across its front and rear side marker positions for the 1953-1955 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is designated for the front side marker position on Light Duty trims.
The T10 wedge base of the 194 requires no locking mechanism, as the bulb is held in place by the tension of the socket itself.
The 97 is an ANSI-standardized single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base, and is designated for the rear side marker position on Light Duty trims.
The BA15s bayonet base of the 97 features a single locating pin, which distinguishes it from dual-pin bayonet variants and makes it non-interchangeable with those types.
The 97 is described as a variant of the 1156 bulb. While both share the BA15s base and single-filament design, wattage differences between variants can affect compatibility, and substitution without confirming electrical ratings is inadvisable.
The power draw of the 97 at 13W is substantially higher than the 3.78W of the 194, reflecting the greater luminous output typically required at the rear marker position.
Both the 194 and 97 conform to ANSI standards recognized in the United States and Canada, indicating standardized dimensional and electrical tolerances within those markets.