International 900A front side marker bulbs measure 194 in size, while rear side marker bulbs measure 97, with each bulb type specified for its corresponding location. The replacement chart covers 1966 to 1967 vehicle production years and documents bulb size specifications for side marker applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb appears across all listed front side marker positions for the International 900A in 1966-1967. It follows the ANSI standard recognized in both the US and Canada, operates at 12 volts, and draws 3.78 watts. Its T10 miniature wedge form factor uses a push-in wedge base rather than a separate socket or pin connector.
The 97 bulb is specified for all rear side marker positions on the International 900A across 1966-1967. It also conforms to ANSI standards for the US and Canadian markets and operates at 12 volts, though its 13-watt draw is substantially higher than that of the 194 used at the front.
The 97 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount. This base type requires a quarter-turn locking motion for installation and is not interchangeable with the wedge base of the 194 bulb.
The 97 is noted as a variant of the 1156 bulb. While the two share a BA15s bayonet base, they are not identical, and substituting one for the other without confirming wattage and voltage compatibility with the specific socket and circuit is not advisable.
Both the 194 and 97 are rated at 12 volts, consistent with the standard electrical system voltage of passenger and light-duty vehicles of that era. The Light Duty designation in the specifications applies to both bulb positions across both model years listed.