International MS1210 front side marker bulb size 194 and rear side marker bulb size 97 represent the specifications for this model. The replacement chart covers 1972 to 1973 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International MS1210 uses two distinct bulb types across its front and rear side marker positions for the 1972-1973 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is classified for light duty applications on the MS1210.
The T10 wedge base of the 194 requires no locking mechanism for retention, as the wedge shape itself holds the bulb within the socket.
The 97 is an ANSI-standard single-filament bulb fitted with a BA15s bayonet base, rated at 12V and 13W, and serves the rear side marker position on the MS1210.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which is a common base type in automotive lighting.
The 97 is described as a variant of the 1156 bulb. Despite this relationship, the two are not directly interchangeable, as physical and electrical differences exist between variants in this family.
The significant wattage difference between the 194 (3.78W) and the 97 (13W) reflects their respective roles, with the higher-wattage 97 providing greater output suited to rear marker visibility requirements.
Both the 194 and 97 conform to ANSI standards recognized in both the United States and Canada, indicating standardized performance and fitment criteria across North American markets.