Chevrolet Biscayne front and rear side marker bulbs utilized 194 and 194NA bulb sizes across multiple model generations. The replacement chart covers 1968 through 1972 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 Chevrolet Biscayne front and rear side marker positions rely on the 194 bulb across the 1968-1972 model range, with the 194NA variant appearing in the front position for 1968 and 1971 specifically.
The 194 is an ANSI-standardized miniature wedge bulb classified under the T10 form factor, operating at 12 volts and drawing 3.78 watts.
The 194NA shares the same ANSI classification, voltage, wattage, and T10 wedge form factor as the 194, with the sole physical distinction being its natural amber-tinted glass envelope.
Because the 194NA produces an amber output through its tinted glass rather than through an external lens or housing, substituting a clear 194 in positions specified for the 194NA would alter the emitted light color.
The rear side marker position uses the clear 194 bulb uniformly across all five model years listed, from 1968 through 1972, without any amber variant appearing in that position.
The T10 wedge base type is a pinless design that is retained by friction within its socket, which is a standard characteristic of the wedge base family across both the 194 and 194NA types.