Chevrolet Corvair front and rear side marker bulbs utilize 194 and 194NA bulb sizes, with front markers accepting either size and rear markers requiring the 194 size. The replacement chart covers 1967 through 1969 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 and 194NA bulbs are the only two bulb types specified across all front and rear side marker positions for the Chevrolet Corvair across the 1967-1969 model years.
Both the 194 and 194NA are ANSI-standardized miniature wedge bulbs sharing the T10 form factor, a 12V operating voltage, and a 3.78W power rating.
The sole distinction between the 194 and 194NA is the natural amber glass envelope on the 194NA, which produces a colored output without relying on a tinted lens.
The Chevrolet Corvair uses the 194NA specifically in the front side marker positions for the 1967 and 1968 model years, indicating those housings used clear or non-amber lenses that required the bulb itself to provide the amber color.
The 1969 front side marker position shifts to the standard 194, suggesting a change in lens or housing design for that model year compared to 1967 and 1968.
All rear side marker positions across 1967-1969 use the standard 194 bulb, with no amber-glass variant specified for any rear application.
Because the 194 and 194NA share the same T10 wedge base and electrical ratings, they are physically interchangeable, though substituting a 194 for a 194NA in a front position with a clear lens would alter the emitted light color.
The T10 wedge base is a pinless design in which the base of the glass envelope itself acts as the retention mechanism within the socket, a common format in low-wattage automotive marker applications.