International 1300D front side marker bulbs measure 194 in size while rear side marker bulbs measure 97, with both bulb types specified for this truck model. The replacement chart covers 1969 to 1970 production years and details 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 International 1300D uses two distinct bulb types across its side marker positions for the 1969-1970 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 recognized in both the US and Canada.
The T10 wedge base of the 194 requires no locking mechanism for retention, as the wedge shape itself holds the bulb within its socket.
The 97 is an ANSI-standard single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base, and is also recognized in both the US and Canada.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with the BA15d double-contact variant despite sharing the same physical collar size.
The 97 is noted as a variant of the 1156, though the two are not identical and direct substitution between them warrants verification of base type and wattage compatibility before use.
The wattage difference between the 194 (3.78W) and the 97 (13W) reflects their respective roles, with the lower-wattage 194 suited to the smaller front marker position and the higher-wattage 97 serving the rear.
Both bulb types are classified under the Light Duty designation for the 1300D across both model years covered in the specifications.