The Merkur Scorpio brake light requires a unique bulb size of 1156 or P21W depending on the specific application. Data for the bulb sizes covers the range of 1988 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Merkur Scorpio uses the 1156 bulb for its brake lights across the 1988-1989 model years. This is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s bayonet base on the 1156 bulb is a single-contact design. This base type is not interchangeable with the BA15d double-contact bayonet base, which is found on dual-filament bulbs such as the 1157.
The center high mount stop light on the 1988-1989 Scorpio takes the 168 bulb, a T10 miniature wedge type rated at 12V and 4.9W. Its significantly lower wattage reflects the supplementary signaling role of this lamp position.
The 168 wedge bulb uses a friction-fit base rather than a bayonet or screw mount. This base style is common in low-current auxiliary lighting positions such as the center high mount stop light.
Both the 1156 and 168 bulbs conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications across those markets.
The 1156 and 168 are not interchangeable. Beyond their different base types, their wattage ratings differ substantially, and substituting one for the other would be incompatible with the socket housings in the Scorpio.