Ford Skyliner Back Up Light Bulb Size

The Ford Skyliner back up light utilizes 1141 and 1129 bulb sizes for the specific lighting components located at the rear of the vehicle. Data for the specified automotive equipment covers the range from 1954 to 1959.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1956-1959	1141
1954-1955	1129

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1129

Other Locations

Additional Notes

The Ford Skyliner back up light specifications cover model years 1954 through 1959, split across two distinct bulb types.
The 1141 is the bulb type used in the Ford Skyliner for model years 1956-1959, making it the more frequently specified bulb across this part's fitment range.
The 1141 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which accepts the bulb in one rotational orientation only.
The 1129 is specified for the Ford Skyliner in model years 1954-1955.
The 1129 is an ANSI-standard dual-filament bulb rated at 12V with a 21/5W output, meaning it operates at 21 watts on its primary filament and 5 watts on its secondary filament.
The 1129 uses a BAY15d bayonet base, which features offset pins to ensure correct polarity alignment, a physical characteristic that distinguishes it from the BA15s base of the 1141.
Because the 1141 uses a BA15s single-pin base and the 1129 uses a BAY15d dual-pin base, the two bulb types are not physically interchangeable despite sharing the same 12V operating voltage.
The 1129 is noted as a variant of the 1157, a widely recognized automotive bulb, though the two are not identical and should not be treated as direct substitutes without verifying base and wattage compatibility.
Both the 1141 and 1129 conform to ANSI standards recognized in the United States and Canada.