Chrysler 300M front turn signal bulbs use 3157NA size while rear turn signal bulbs use 3157 size. The replacement chart covers 1999 to 2001 vehicle production years with corresponding bulb size specifications.
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 3157NA bulb for the front turn signal across the 1999-2001 model years.
The 3157NA is a dual-filament wedge bulb classified under the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament.
The "NA" suffix in the 3157NA designation indicates natural amber glass, meaning the bulb produces an amber-tinted output without relying on a colored lens.
The rear turn signal on the 300M uses the 3157 bulb across the same 1999-2001 model years.
The 3157 shares the same T25 wedge form factor, dual-filament design, and 12V/27W/7W electrical ratings as the 3157NA.
Both the 3157NA and 3157 conform to ANSI standards applicable in the United States and Canada.
The dual-filament design in both bulb types allows a single bulb to serve two functions, typically combining turn signal operation with a secondary running or parking light function.
Although the 3157 and 3157NA share the same physical form factor and electrical ratings, the amber glass coating on the 3157NA makes the two bulbs functionally distinct for their respective positions on the 300M.