Ram 1500 Classic Brake Bulb Size

The Ram 1500 Classic brake light requires 7440, 921, and 3057 bulb sizes for the specific lighting components. Data for the provided bulb specifications covers the 2019 to 2023 range.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Brake

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2023	7440	W21W	Check Price
2021	921	W16W	Check Price
2019	3057 (Without Projector-Type Headlamps)	3057	Check Price

Center High Mount Stop Light

Years	US Type	EU Type	Shop
2023	921	W16W	Check Price
2021	921	W16W	Check Price
2019	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440	Check Price
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057	Check Price

Other Locations

Additional Notes

The Ram 1500 Classic uses three distinct brake bulb types across its model years: the 7440, 921, and 3057, all of which conform to ANSI standards recognized in both the United States and Canada.
The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W. It serves as the brake bulb for the 2023 Ram 1500 Classic.
The 921 is a wedge bulb in the T15 form factor, rated at 12V and 16W. It is the specified brake bulb for the 2021 model year and is also the designated bulb across the 2019-2023 range for the Center High Mount Stop Light position.
The 3057 is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a high filament of 27W and a low filament of 7W. Its dual-filament design allows it to serve both brake and running light functions within a single housing.
The 3057 applies specifically to the 2019 Ram 1500 Classic on vehicles without projector-type headlamps, indicating that headlamp configuration on this model year is a determining factor in brake bulb fitment.
The 7440 and 921 are both single-filament bulbs, but they differ in wattage, physical form factor, and socket type, making them non-interchangeable despite both using wedge-style bases.
The 3057 and 921 are also non-interchangeable. The 3057 carries a dual-filament design and a T25 form factor, while the 921 is a single-filament T15 bulb with a lower wattage rating.