Lincoln Versailles front turn signal bulbs utilize 1034NA or 1157NA size, while rear turn signal bulbs use 1157 size. The replacement chart covers 1977 through 1980 production 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.
The 1157 and 1034NA bulbs are the two types specified for the Lincoln Versailles across all listed model years and positions. Both are dual-filament bulbs operating at 12V with a 21W/5W power rating, and both use the BAY15d bayonet base.
The BAY15d bayonet base is a two-pin offset base design. The offset pin placement ensures correct polarity orientation during installation, which is a functional requirement for dual-filament operation.
The dual-filament construction in both bulb types serves two distinct brightness levels within a single housing, with the higher-wattage filament typically assigned to the turn signal function and the lower-wattage filament to the parking light function.
The 1034NA is described as a variant of the 1157. The primary distinction is the natural amber glass envelope of the 1034NA, which produces an amber light output without relying on an amber lens.
The 1157NA shares the same natural amber glass construction as the 1034NA and carries identical electrical ratings, but it is a separately designated ANSI bulb type.
The front turn signal of the Lincoln Versailles used the 1034NA for model years 1978-1980, then the 1157NA for the 1977 model year. Both the 1034NA and 1157NA share the BAY15d base, but they carry different ANSI designations and are not listed as interchangeable within these specifications.
The rear turn signal used the 1157 across all four listed model years, 1977-1980. The 1157 uses the same BAY15d base and 12V/21W/5W ratings as the NA variants but has a clear glass envelope rather than natural amber glass.
Because the front positions specify amber-glass bulb types while the rear position specifies the clear-glass 1157, the amber coloring at the front is produced by the bulb itself rather than the lens, whereas the rear relies on either the lens or reflector housing to produce the required signal color.