Ford Fairlane Back Up Light Bulb Size

The Ford Fairlane back up light uses 1156, P21W, 1073, 1141, and 1129 bulb sizes depending on the specific version of the vehicle. Available data covers the range from 1955 through 1970.

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
1962-1970	1156
1961	1073
1958-1960	1156
1956-1957	1141
1955	1129

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	1073
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 Fairlane back up light specifications span model years 1955 through 1970, covering four distinct bulb types across that range.
The 1156 bulb is the most widely used type in these specifications, appearing in the Ford Fairlane across 1958-1960 and 1962-1970.
The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is an ANSI standard part used in the US and Canada.
The 1141 bulb shares the same BA15s bayonet base, voltage, and wattage rating as the 1156, though the two carry different ANSI designations and are not confirmed as interchangeable in these specifications.
The 1141 was specified for the Ford Fairlane in 1956-1957.
The 1073 bulb, specified for the 1961 Ford Fairlane, uses the same BA15s bayonet base as the 1156 but operates at a lower wattage of 13W versus 21W, making it a lower-output variant within the same base family.
The 1129 bulb, specified for the 1955 model year, is the only dual-filament bulb in these specifications, rated at 12V with a 21/5W output and fitted with a BAY15d bayonet base.
The BAY15d base of the 1129 is physically distinct from the BA15s base used by the 1156, 1141, and 1073, meaning those bulbs are not cross-compatible with the 1955 socket.
The 1129 is noted as a variant of the 1157, a common dual-filament automotive bulb, sharing its BAY15d base type and dual-filament construction.
All four bulb types in these specifications conform to ANSI standards applicable to the US and Canadian markets.