Lincoln Versailles front side marker bulbs use 1157NA or 1034NA sizes, while rear side marker bulbs use 1157 size. The replacement chart covers 1977 through 1980 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
All side marker positions across the Lincoln Versailles (1977-1980) use dual-filament bulbs operating at 12V with a 21W/5W power rating. The dual-filament design provides separate circuits for running light and turn signal or braking functions within a single bulb.
Every bulb type listed for the Versailles uses a BAY15d bayonet base. This base style features two offset pins at different heights, which prevents incorrect insertion and ensures polarity alignment during installation.
The rear side marker position uses the 1157 bulb across all four model years (1977-1980), making it the only position with no year-to-year variation in bulb specification throughout the production run covered.
The front side marker position transitioned from the 1034NA (1977-1978) to the 1157NA (1979-1980). Both bulbs share the same BAY15d base and 12V/21W/5W ratings, but they are distinct ANSI part numbers.
The 1034NA is described as a variant of the 1157, and both the 1034NA and 1157NA carry natural amber glass. The 1157, used at the rear, has a clear glass envelope, meaning its amber output relies on a colored lens rather than the bulb itself.
Because the 1034NA and 1157NA share the same base type and electrical ratings as the standard 1157, physical fitment across these positions is closely related, though substitution between part numbers should be treated with caution given their distinct ANSI designations.
All three bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada, indicating they meet a common North American regulatory framework for automotive lighting components.