Oldsmobile Custom Cruiser Back Up Light Bulb Size

The Oldsmobile Custom Cruiser back up light utilizes 2057, 1156, and P21W bulb sizes depending on the specific production period for the vehicle. Available data for the lighting components spans from 1971 through 1992.

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
1991-1992	2057
1971-1990	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Oldsmobile Custom Cruiser back up light bulb specifications cover model years 1971 through 1992.
Two bulb types are specified across this range: the 1156 for 1971-1990 and the 2057 for 1991-1992.
The 1156 is a single-filament bulb operating at 12V with a rated output of 21W, mounted on a BA15s bayonet base.
The 2057 is a dual-filament bulb operating at 12V with filament ratings of 26.9W and 8W, mounted on a BAY15d bayonet base.
Both the 1156 and 2057 are ANSI standardized bulbs recognized in the United States and Canada.
The BA15s base of the 1156 and the BAY15d base of the 2057 are physically distinct bayonet mount types, meaning the two bulbs are not interchangeable despite their similar external profiles.
The 2057 is described as a brighter variant of the 1157, sharing its dual-filament design and BAY15d base, though the 1157 is not itself specified for the Custom Cruiser in this application.
The shift from the 1156 to the 2057 in the 1991-1992 Oldsmobile Custom Cruiser represents a change from a single-filament to a dual-filament socket configuration in the back up light assembly.