The Buick Opel uses a 67 bulb size for both front and rear side marker applications. The replacement chart covers 1976 to 1979 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 Buick Opel uses the 67 bulb in both the front and rear side marker positions across the 1976-1979 model years.
The 67 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It operates on a 12-volt electrical system and draws 8 watts, placing it in the low-wattage range typical of side marker applications.
The 67 uses a BA15s bayonet base, which is a single-contact base with a 15mm collar and a single locating pin on the side.
As a single-filament bulb, the 67 serves one lighting function only, consistent with its use in side marker positions rather than combination stop/tail applications.
The 67 is related to the 1156 bulb family but is a lower-wattage variant, meaning the two share the same BA15s base type yet are not electrically equivalent and are not interchangeable without accounting for the wattage difference.
Because the front and rear side marker positions on the Buick Opel share the same bulb size across all four model years, a single bulb type services all four side marker sockets on the vehicle.