The International A112 uses a 194 bulb size for front side marker applications and a 97 bulb size for rear side marker positions. The replacement chart covers 1957 to 1958 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 International A112 uses two distinct bulb types across its front and rear side marker positions: the 194 at the front and the 97 at the rear, for both the 1957-1958 model years under the Light Duty classification.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, operating at 12 volts and drawing 3.78 watts, making it a low-wattage lamp suited to marker lighting rather than primary illumination.
The T10 wedge base of the 194 requires no locking mechanism for retention; the wedge shape itself holds the bulb within its socket, which distinguishes it from bayonet-style fitments.
The 97 is an ANSI-standardized single-filament bulb mounted on a BA15s bayonet base, operating at 12 volts and drawing 13 watts, a notably higher wattage than the front marker bulb.
The BA15s designation on the 97 indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with the BA15d double-contact variant despite sharing the same physical collar size.
The 97 is listed as a variant of the 1156, meaning the two share the BA15s base type, though they differ in wattage and are not direct substitutes for one another in all applications.
Both the 194 and 97 carry ANSI standardization recognized in the United States and Canada, meaning their electrical and physical specifications conform to a defined industry standard rather than a proprietary format.
The wattage difference between the front 194 (3.78W) and the rear 97 (13W) reflects a significant disparity in power draw between the two marker positions on the International A112.