Pontiac Grandville front and rear side marker bulbs utilize 194 and 67 sizes for front applications, with 194 and 1157 sizes for rear positions. The replacement chart covers 1971 through 1975 production years and documents bulb size specifications across the model range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the most frequently specified size across the Pontiac Grandville side marker data, appearing in both front and rear positions for the 1973-1975 model years.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards for the US and Canadian markets.
The 67 bulb is specified for the front side marker on the 1971 Grandville. It uses a BA15s single-contact bayonet base and operates at 12V and 8W, making it a lower-wattage variant of the 1156 bulb type.
The 1157 bulb is specified for the rear side marker on the 1971 Grandville. Unlike the 67, it carries a dual-filament design with a BAY15d bayonet base, rated at 12V with a 21W/5W output for its two filaments.
The BA15s base of the 67 and the BAY15d base of the 1157 are physically similar in size but are not interchangeable. The BAY15d base features offset locating pins to prevent incorrect installation of dual-filament bulbs in single-filament sockets.
The wedge base of the 194 is mechanically incompatible with the bayonet bases used by the 67 and 1157, meaning no cross-substitution is possible between these bulb families without a socket adapter.
The front and rear side marker positions on the 1971 Grandville use different bulb types, with the 67 at the front and the 1157 at the rear, requiring separate bulb stock for a full replacement of that model year.
For the 1973-1975 Grandville, the front and rear side markers share the same 194 bulb specification, meaning a single bulb type covers all four side marker positions on those vehicles.