The Lincoln Mark II front and rear turn signal bulbs both require a 1034 size bulb for proper operation. The replacement chart covers vehicle production spanning 1956 to 1957.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 bulb is the sole bulb type specified for the Lincoln Mark II across all listed positions and model years, appearing in both the front and rear turn signal applications for 1956-1957.
The 1034 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve more than one lighting function simultaneously.
It operates on a 12-volt electrical system and carries a wattage rating of 21/5W, where the higher figure corresponds to the brighter filament and the lower figure to the dimmer one.
The 1034 uses a BAY15d bayonet base, a two-pin base type in which the two pins are offset at different heights, a physical feature that ensures the bulb can only be seated in one rotational orientation.
The 1034 is classified as an ANSI standard bulb, indicating its specifications conform to a recognized North American standardization body, with applicability noted for both the United States and Canada.
The 1034 is described as a variant of the 1157, a more widely produced bulb type that shares the same dual-filament, BAY15d configuration but differs in its exact electrical ratings.
Because the 1034 and 1157 are variants rather than identical types, direct substitution between them without confirming voltage and wattage compatibility with the vehicle's circuit is not supported by the specifications.
The front and rear turn signal positions on the Lincoln Mark II for both 1956 and 1957 share the same bulb size, indicating a uniform fitment requirement across those four application points.