Chevrolet C60 front and rear side marker bulbs utilize 1157 and 194 sizes respectively, with the front bulb measuring 1157 and the rear bulb size designated as 194. The replacement chart covers vehicle production spanning 1960 to 1988, detailing bulb specifications across the entire manufacturing range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet C60 uses two distinct bulb types across its side marker positions: the 1157 for the front and the 194 for the rear, with both assignments remaining unchanged across the 1960-1988 model range.
The 1157 is a dual-filament bulb operating at 12V with a 21W main filament and a 5W secondary filament, mounted via a BAY15d bayonet base. Its dual-filament design means it is not directly interchangeable with single-filament bulbs of similar size without wiring or socket modifications.
The 1157 conforms to ANSI standards recognized in both the United States and Canada, and its BAY15d bayonet base features two offset pins that prevent incorrect insertion orientation.
The 194 is a miniature wedge-type bulb in the T10 form factor, rated at 12V and 3.78W. Its wedge base relies on direct contact with the socket rather than a locking pin, which is a fundamentally different retention method than the bayonet base used by the 1157.
Because the 1157 and 194 use incompatible base types, a BAY15d bayonet socket and a T10 wedge socket are not interchangeable, meaning front and rear side marker assemblies on the C60 require separate replacement bulbs.
The 194 also conforms to ANSI standards applicable in the United States and Canada, placing both bulbs used on the C60 within the same regulatory framework despite their differing wattage and base configurations.
The significant wattage difference between the 1157 (21W/5W) and the 194 (3.78W) reflects their respective roles, with the higher-output dual-filament 1157 suited to a front position where greater visibility output is required.
The consistency of bulb assignments across all documented model years for the Chevrolet C60 indicates that a single 1157 and a single 194 specification apply uniformly to the front and rear side marker positions throughout the 1960-1988 production span.