Ford Country Squire Back Up Light Bulb Size

The Ford Country Squire back up light utilizes 1156, P21W, 1073, 1141, and 1129 bulb sizes depending on the specific production period. Available data covers the range from 1953 through 1991.

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
1987-1991	1156
1961-1974	1156
1960	1073
1959	1156
1956-1958	1141
1953-1955	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 1156 bulb is the most frequently specified backup light bulb across the Ford Country Squire model range, covering the 1961-1991 model years with the exception of 1960, as well as 1959.
The 1156 is a single-filament bulb operating at 12V and 21W, fitted with a BA15s bayonet base, and is classified under the ANSI standard applicable in the United States and Canada.
The 1141 bulb was specified for the 1956-1958 Ford Country Squire. It shares the same BA15s bayonet base, 12V operating voltage, and 21W rating as the 1156, making the two electrically similar despite carrying different ANSI designations.
The 1073 bulb was specified for the 1960 Ford Country Squire. While it shares the BA15s bayonet base and 12V operating voltage with the 1156, it draws only 13W, making it a lower-wattage variant that is not a direct electrical substitute.
The 1129 bulb was specified for the 1953-1955 Ford Country Squire. Unlike all other bulbs in these specifications, the 1129 is a dual-filament type with a BAY15d bayonet base, rated at 12V and 21/5W.
The BAY15d base of the 1129 is physically distinct from the BA15s base used by the 1156, 1141, and 1073 bulbs. These two base types are not interchangeable, as the BAY15d features offset locating pins to accommodate its dual-filament design.
The 1129 is noted as a variant of the 1157, a widely recognized dual-filament automotive bulb, which places it within a different functional category than the single-filament bulbs specified for later model years.
Although the 1156 and 1141 share identical electrical ratings and the same BA15s base, they carry separate ANSI designations and are not guaranteed to be interchangeable in all applications without confirming socket and housing compatibility.