Mazda 6 tail light assemblies utilize inner bulb size 12961 and outer bulb sizes 194, 3057, and 7443. The replacement chart documents bulb specifications across 2003 to 2017 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 bulb is an ANSI-standard dual-filament wedge type in a T20 form factor, rated at 12V with filaments drawing 21W and 5W respectively. It fits the inner tail light of the Mazda 6 for the 2003, 2004, and 2006-2008 model years.
The 3057 bulb is also an ANSI-standard dual-filament wedge type, but in a larger T25 form factor, rated at 12V with filaments drawing 27W and 7W. It applies to the inner tail light for 2009-2013 model years, exclusively on trims equipped with halogen capsule headlamps.
The 12961 is a Philips part number rather than an ANSI designation. It is a single-filament miniature wedge bulb in a T10 form factor with a W2.1x9.5d base, rated at 12V and 5W. It fits the inner tail light for 2014-2017 model years, with the 2016 and 2017 entries restricted to halogen capsule headlamp trims.
The 194 is an ANSI-standard single-filament miniature wedge bulb, also in a T10 form factor, rated at 12V and 3.78W. It is listed for the 2015 inner tail light position alongside the 12961, indicating that two different bulb sizes are specified for that model year.
The T10, T20, and T25 designations refer to the tubular bulb body width in units of one-eighth of an inch, meaning the T25 body is physically wider than the T20, which in turn is wider than the T10. These size differences affect socket fitment and the two bulb types are not interchangeable with one another.
The 12961 and 194 bulbs share the same T10 form factor, but the 12961 carries a W2.1x9.5d base specification under the IEC/Philips naming system. Substituting one for the other without confirming base and wattage compatibility with the specific socket could result in an improper fit or incorrect light output.
The halogen capsule headlamp condition attached to the 3057 entries for 2009-2013 and the 12961 entries for 2016-2017 indicates that the inner tail light bulb size is trim-dependent for those years, meaning vehicles without that headlamp configuration may use a different bulb not reflected in those rows.
The dual-filament construction of the 3057 and 7443 bulbs allows a single socket to serve two lighting functions, typically a lower-wattage running or parking function and a higher-wattage brake or turn signal function. The 3057 high filament draws 27W compared to the 7443 high filament at 21W, a difference relevant to circuit load and bulb socket ratings.