Oldsmobile Vista Cruiser Back Up Light Bulb Size

The Oldsmobile Vista Cruiser back up light utilizes 1156 and P21W bulb sizes for the rear illumination system. Available data for the specified lighting components covers the range from 1964 to 1975.

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
1964-1975	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Oldsmobile Vista Cruiser uses the 1156 bulb for the back up light across all listed model years, spanning 1964-1975.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail duties.
The 1156 operates at 12 volts and 21 watts, which is consistent with standard automotive electrical systems of that era.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width.
The 1156 is an ANSI-standardized bulb, recognized across the United States and Canada, which reflects broad availability within the North American market.
Because the 1156 is a single-filament type, it is not interchangeable with the 1157, a visually similar bulb that carries a dual-filament design and a different pin configuration despite sharing the same BA15 base family.