International 1000D front side marker bulbs use 194 size while rear side marker bulbs use 97 size. The replacement chart covers 1969 to 1970 vehicle 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 1000D uses two distinct bulb types across its side marker positions: the 194 at the front and the 97 at the rear, both for the 1969-1970 model years in Light Duty trim.
The 194 is an ANSI-standardized miniature wedge bulb of the T10 form factor, operating at 12 volts and drawing 3.78 watts, which places it among the lower-wattage bulbs used in automotive marker applications.
The T10 wedge base of the 194 requires no locking mechanism for retention, as the wedge-shaped base itself holds the bulb within its socket by friction.
The 97 is an ANSI-standardized single-filament bulb fitted with a BA15s bayonet base, operating at 12 volts and drawing 13 watts, making it substantially higher in wattage than the front marker bulb.
The BA15s designation on the 97 indicates a single-contact bayonet base with a 15mm collar, which is a common base type in automotive lighting but requires correct socket alignment during installation.
The 97 is noted as a variant of the 1156 bulb type. While the two share a BA15s base, they are not fully interchangeable, as differences in wattage and filament position can affect fitment and function in sockets designed for one or the other.
Both the 194 and 97 carry ANSI standardization recognized in both the United States and Canada, meaning their electrical and physical specifications conform to a defined industry standard rather than being proprietary to a single manufacturer.
The front and rear side marker positions on the International 1000D (1969-1970) use different base types entirely, a wedge base at the front and a bayonet base at the rear, making the two bulbs non-interchangeable between positions.