The Opel 1900 uses 67 and 97 bulb sizes for both front and rear side marker positions. The replacement chart covers 1971 to 1975 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 Opel 1900 uses two bulb types across its side marker positions: the 67 and the 97, both governed by ANSI standards applicable to the US and Canadian markets.
Both the 67 and the 97 are single-filament bulbs sharing the BA15s bayonet base, meaning the physical base format is identical between the two types.
Despite sharing the same BA15s base, the 67 and the 97 differ in wattage. The 67 operates at 8W, while the 97 operates at 13W, making them distinct variants within the same 1156 family.
Both bulb types operate on a 12V electrical system, consistent with standard automotive voltage for the era.
The 1973-1975 Opel 1900 uses the 67 bulb in both the front and rear side marker positions.
The 1971-1972 model years specify the 97 bulb for both front and rear side marker positions.
The front and rear side marker positions mirror each other exactly across all listed years, with no asymmetry between the two positions in any given model year.
Although the BA15s base is shared between the 67 and the 97, substituting one for the other would result in a wattage mismatch, as the two types draw different amounts of current from the circuit.