International L153 vehicles utilized 194 bulb size for front side marker applications and 97 bulb size for rear side marker positions. The replacement chart covers 1950 to 1952 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 L153 uses the 194 bulb for the front side marker position across the 1950-1952 model years, and the 97 bulb for the rear side marker position across the same span.
The 194 is a T10 miniature wedge bulb rated at 12 volts and 3.78 watts, conforming to ANSI standards recognized in both the United States and Canada.
The wedge base of the 194 bulb requires no metal base shell, as the glass envelope itself acts as the retention mechanism within the socket.
The 97 bulb is a single-filament type mounted on a BA15s bayonet base, rated at 12 volts and 13 watts, and also carries ANSI recognition in the United States and Canada.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which positions and locks the bulb through a twist-and-seat motion.
At 13 watts, the 97 bulb draws considerably more power than the 194, reflecting its role in a rear-facing position where greater light output is typically required for visibility.
The 97 bulb is noted as a variant of the 1156, meaning the two share a similar base and general construction, though they are not identical and are not listed as interchangeable within these specifications.
The front and rear side marker positions on the International L153 (1950-1952) use bulbs from two distinct base families, the wedge and the bayonet, meaning the sockets for each position are not compatible with one another.