The Oldsmobile Custom Cruiser brake light utilizes 1157 and 2057 bulb sizes for the rear lighting system. Available information covers the production span from 1971 through 1992.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 bulb is the most widely used brake bulb across the Oldsmobile Custom Cruiser's production span, covering model years 1971-1990. It is a dual-filament ANSI-standard bulb rated at 12V with a high filament draw of 21W and a low filament draw of 5W, mounted on a BAY15d bayonet base.
The BAY15d bayonet base used by the 1157 features offset pins, which physically prevent incorrect single-filament bulbs from being seated in the socket. This base design is standard across dual-filament automotive stop and tail applications.
For the 1991-1992 model years, the Oldsmobile Custom Cruiser brake bulb specification changed to the 2057. Like the 1157, the 2057 is a dual-filament bulb with a BAY15d bayonet base and the same 12V operating voltage.
Although the 2057 and 1157 share the same BAY15d base and are physically interchangeable in many sockets, they are not electrically identical. The 2057 draws 26.9W on its high filament versus the 1157's 21W, making the 2057 the brighter of the two bulbs.
The Center High Mount Stop Light (CHMSL) on the Custom Cruiser used the 1156 bulb for model years 1986-1990. The 1156 is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base.
The BA15s base of the 1156 has a single offset pin, distinguishing it from the dual-offset-pin BAY15d base used by the 1157 and 2057. These two base types are not interchangeable despite their visual similarity.
For the 1991-1992 model years, the CHMSL specification shifted from the 1156 to the 561. The 561 is a festoon-type bulb with a 44mm length, making contact through end caps rather than a bayonet base, and is rated at 12V and 12W.
The festoon format of the 561 requires a dedicated holder with spring-loaded end contacts, which is physically incompatible with the BA15s socket used by the 1156. The CHMSL housing on 1991-1992 models was designed specifically for this festoon format.
All four bulb types specified across the Custom Cruiser's brake lighting system conform to ANSI standards applicable in both the United States and Canada, indicating consistent regulatory compliance across the vehicle's production history.
The brake bulb specifications for the Custom Cruiser reflect two distinct fitment groups: the main brake lights, which used dual-filament BAY15d bulbs throughout the entire model range, and the CHMSL, which used single-filament or festoon bulbs depending on the model year.