The Merkur Scorpio front side marker uses a 1157 bulb size while the rear side marker requires an 89 bulb size. Replacement chart data covers 1988 to 1989 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Merkur Scorpio uses two distinct bulb types across its front and rear side marker positions for the 1988-1989 model years: the 1157 at the front and the 89 at the rear.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output, meaning it operates one filament for running light duty and a second, brighter filament for signaling or stop functions.
The 1157 uses a BAY15d bayonet base, a two-pin offset base that physically prevents single-filament bulbs from being seated in its place.
The 89 is a single-filament bulb rated at 12V and 13W, operating on a BA15s bayonet base, which is a single-pin design.
The 89 bulb is a lower wattage variant of the 1156, sharing the same BA15s base type but drawing less power, which makes the two non-equivalent despite their physical similarity.
Because the 1157 uses a BAY15d base and the 89 uses a BA15s base, the front and rear side marker sockets on the Merkur Scorpio are not interchangeable with each other.
Both the 1157 and the 89 conform to ANSI standards applicable in the United States and Canada.
Substituting a 1156 for the 89 in the rear side marker position would introduce a wattage mismatch, as the 1156 is rated higher than the 13W specification of the 89.