International B112 side marker bulbs utilize 194 size for front applications and 97 size for rear positions. The replacement chart covers 1959 to 1960 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 B112 uses two distinct bulb types across its front and rear side marker positions: the 194 for the front and the 97 for the rear, covering the 1959-1960 model years under the Light Duty classification.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W. Its wedge base design means it requires no separate socket locking mechanism, as the bulb body itself acts as the retention element.
The 97 is an ANSI-standardized single-filament bulb fitted with a BA15s bayonet base, rated at 12V and 13W. The BA15s designation indicates a single-contact bayonet mount with a 15mm base width.
The 97 is noted as a variant of the 1156 bulb. While the two share a BA15s bayonet base, they are not universally interchangeable, as differences in wattage, filament position, or base indexing between variants can affect fitment and function in specific housings.
The wattage difference between the two bulb types is substantial. At 13W, the rear-mounted 97 draws more than three times the power of the front-mounted 194 at 3.78W, reflecting the typically higher luminous output required of rear marker positions.
Both the 194 and 97 are recognized under ANSI standards applicable in both the United States and Canada, indicating a shared North American standardization framework for these bulb designations.