Chevrolet El Camino front and rear side marker bulbs utilize 194 and 194NA bulb sizes, with front markers accommodating either size and rear markers using the 194 size. The replacement chart covers vehicle production spanning 1968 to 1987, detailing bulb size specifications across all model years within that range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet El Camino uses the 194 bulb for both front and rear side markers across the 1968-1987 model years, with one noted exception for the 1968 front side marker position.
The 194 is classified as a T10 miniature wedge bulb operating at 12 volts and 3.78 watts, conforming to ANSI standards recognized in both the United States and Canada.
The T10 designation refers to the bulb's tubular envelope, with the number indicating a width of 10 eighths of an inch. The wedge base design eliminates the need for a separate metal base, as the glass envelope itself acts as the retention mechanism within the socket.
The 1968 Chevrolet El Camino front side marker position specifies the 194NA rather than the standard 194. The 194NA is a T10 miniature wedge bulb sharing the same 12-volt, 3.78-watt electrical rating but fitted with natural amber-tinted glass.
Because the 194 and 194NA share identical electrical ratings and the same T10 wedge base, they are physically interchangeable. However, substituting a clear 194 in place of the 194NA would remove the amber tint integral to the glass, which may affect the color output of the lens assembly.
The rear side marker for the 1968 model year specifies the standard clear 194, distinguishing it from the amber-specific requirement at the front position for that same year.
The consistent use of the 194 bulb across both front and rear positions for the 1969-1987 model years means a single bulb type serves all four side marker sockets on those vehicles.