The Acura CL tail light utilizes 7443 and 3757NA bulb sizes for the lighting components located at the rear of the vehicle. Data for the specific bulbs covers the range from 1997 through 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura CL uses three distinct bulb types across its tail light positions: the BAY15d bayonet-base bulbs 3496 and 2057 for the first-generation model, and the wedge-base bulbs 7443 and 3757NA for the second-generation outer tail light position.
The 3496 bulb is an ANSI-standard dual-filament bulb with a BAY15d bayonet base, operating at 12V, and is specified for the inner tail light position on the Acura CL across the 1997-1999 model years.
The 2057 is also a dual-filament, BAY15d bayonet-base bulb rated at 12V with a wattage of 26.9W on the high-filament and 8W on the low-filament. It is a brighter variant of the 1157 and is specified for the outer tail light on the 1997-1999 CL.
Both the 3496 and 2057 share the BAY15d bayonet base, which is the same base type found on the widely used 1157 bulb. Despite this shared base, the two are not the same bulb and serve different positions on the vehicle.
The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with filaments drawing 21W and 5W respectively. It is specified for the outer tail light on the 2001-2003 Acura CL.
The 3757NA is a dual-filament T25 wedge bulb with natural amber glass, operating at 12V. It is specified for the outer tail light on the 1997-1999 CL, alongside the 2057, indicating that the outer tail light position for those years carried two separate bulb sockets.
The natural amber glass of the 3757NA is an integral part of the bulb itself, meaning the color is produced by the glass envelope rather than by the lens housing alone.
The T20 and T25 designations on the 7443 and 3757NA respectively refer to wedge-base bulb sizes, with T25 being physically larger than T20. These two bulbs are not interchangeable despite both using wedge bases.
All four bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across the listed sizes.
The outer tail light position on the Acura CL transitioned from the BAY15d bayonet-base 2057 in the 1997-1999 model years to the T20 wedge-base 7443 in the 2001-2003 model years, reflecting a base-type change between the two generations that makes cross-generation substitution incompatible.