The Mazda B1800 front side marker uses a 67 bulb size while the rear side marker requires a 1157 bulb size. The replacement chart covers 1977 to 1978 vehicle 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 Mazda B1800 uses two distinct bulb types across its side marker positions for the 1977-1978 model years: the 67 at the front and the 1157 at the rear.
The 67 bulb is an ANSI-standard single-filament type rated at 12V and 8W, fitted with a BA15s bayonet base.
The BA15s base is a single-contact bayonet mount, meaning it is not interchangeable with dual-contact bayonet bases without modification.
The 67 bulb is described as a lower wattage variant of the 1156, sharing the same BA15s base type but drawing significantly less power at 8W compared to the 1156's higher output.
The 1157 bulb is an ANSI-standard dual-filament type rated at 12V with a 21W/5W output, fitted with a BAY15d bayonet base.
The BAY15d base on the 1157 features offset pins that prevent insertion into a BA15s socket, making the front and rear side marker bulbs of the Mazda B1800 physically non-interchangeable.
The dual-filament design of the 1157 allows it to operate at two brightness levels, with the 5W filament typically serving a running or parking function and the 21W filament serving a signaling function.
Both the 67 and 1157 are recognized ANSI standards applicable in the United States and Canada, indicating standardized dimensional and electrical specifications across manufacturers.