The Lincoln Mark VIII brake light requires a 3357 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the period from 1993 through 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln Mark VIII uses the 3357 bulb for its brake lights across all six model years covered, from 1993 to 1998.
The 3357 is an ANSI-standard single-filament wedge bulb in the T25 form factor, rated at 12V and 27W. Its single filament means it operates at one fixed output level, making it suited for dedicated brake light circuits rather than combined stop/tail functions.
The center high mount stop light (CHMSL) on the Lincoln Mark VIII does not use a consistent bulb type across its production run, with three different bulb sizes specified depending on the model year.
The 1993 Mark VIII CHMSL uses the 921 bulb, a T15 wedge type rated at 12V and 16W. The T15 form factor is physically smaller than the T25, meaning the 921 is not interchangeable with the 3357 or 3157 bulbs used in other positions on this vehicle.
For the 1994-1995 Mark VIII, the CHMSL specification shifts to the 3357, the same bulb used in the standard brake light positions for those years.
From 1996 to 1998, the CHMSL specification changes again to the 3157, a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament. The dual-filament design allows the same bulb to serve both a bright and a dim function within a single circuit.
Although the 3357 and 3157 share the T25 form factor and the same 27W high-filament rating, they are not fully interchangeable. The 3157 carries a second 7W filament and the additional electrical contact that supports it, which distinguishes it from the single-filament 3357.
All three bulb types referenced in these specifications, the 3357, 3157, and 921, conform to ANSI standards applicable in both the United States and Canada.