The Chrysler 300M brake light utilizes 2458 and 3157 bulb sizes for the lighting system. Data for the lighting components covers the range from 1999 to 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chrysler 300M uses the 3157 bulb for its brake lights across the 1999-2001 model years.
The 3157 is a dual-filament wedge bulb classified under the T25 body type, rated at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament, conforming to ANSI standards for the US and Canadian markets.
The dual-filament design of the 3157 allows a single bulb to serve two lighting functions, which in brake light applications typically means the lower-wattage filament handles the tail light function while the higher-wattage filament activates under braking.
The center high mount stop light on the Chrysler 300M uses the 921 bulb across the same 1999-2001 model years.
The 921 is a single-filament wedge bulb classified under the T15 body type, rated at 12V and 16W, also conforming to ANSI standards for the US and Canadian markets.
The T15 body type of the 921 is physically smaller than the T25 body type of the 3157, meaning the two bulbs are not interchangeable despite both using wedge-style bases.
The 3157 and 921 are both ANSI-standardized bulbs, indicating their physical and electrical specifications are governed by a defined industry standard rather than being proprietary to a specific manufacturer.