Mercury Park Lane front and rear turn signal bulbs utilized 1157NA, 1034NA, and 1034 bulb sizes across multiple production generations. The replacement chart covers 1958 through 1968 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The two most common bulb types across the Mercury Park Lane turn signal specifications are the 1157 and 1034, along with their respective "NA" variants. All four types share the same BAY15d bayonet base, dual-filament design, and 12V/21W/5W electrical ratings.
The BAY15d bayonet base is a double-contact offset-pin base, where the two pins are positioned at different heights to ensure correct polarity orientation during installation.
The dual-filament construction in all listed bulbs serves two functions within a single housing: the higher-wattage 21W filament operates for turn signaling, while the lower-wattage 5W filament serves as a running or parking light.
The 1034 and 1034NA are each described as variants of the 1157, sharing identical voltage, wattage, and base type. Despite this relationship, they carry distinct ANSI designations and are listed separately in the Mercury Park Lane fitment data.
The "NA" suffix on the 1157NA and 1034NA designates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an external coating or the lens housing.
The Mercury Park Lane (1966-1968) front turn signal position specifies the 1157NA, while the rear turn signal for the same years specifies the standard 1157. Both positions therefore use bulbs with the same electrical characteristics, differing only in glass color.
For the 1964-1965 model years, the front turn signal position uses the 1034NA, whereas the rear position uses the 1157. These two bulbs share the same base type and wattage ratings but carry different ANSI designations, and substitution between them is not confirmed by the specifications.
The 1958-1960 model years use the 1034 in both the front and rear turn signal positions, making it the only configuration in these specifications where a single bulb type covers both positions on the vehicle.