The Ford Sprint front turn signal requires either a 1034NA or 1157 bulb size, while the rear turn signal uses a 1157 bulb size. This replacement chart covers vehicle production spanning 1963 to 1964.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 bulb is the most widely used type across these specifications, appearing in the front turn signal for 1963 and in the rear turn signal for both 1963 and 1964.
The 1157 is an ANSI-standard dual-filament bulb rated at 12V and 21W/5W, fitted with a BAY15d bayonet base.
The dual-filament design of the 1157 allows it to serve two brightness levels, typically used for combined stop and tail or turn signal functions.
The 1034NA is used exclusively in the 1964 Ford Sprint front turn signal position.
The 1034NA shares the same BAY15d bayonet base and 12V, 21/5W electrical rating as the 1157, and is described as a variant of it.
The distinguishing feature of the 1034NA is its natural amber glass envelope, which produces a colored output without relying on an amber lens.
Both bulbs conform to ANSI standards applicable in the United States and Canada.
Because the 1034NA and 1157 share the same base type and wattage, physical fitment is compatible, but substituting one for the other affects whether amber coloring is produced by the bulb itself or by the vehicle's lens.