When doing replacement or upgrading on 2003 – 2018 Mazda 6 Hatchback Sedan Wagon capsule halogen headlamps HID with, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2003 – 2004 H1
High Beam Headlight2003 – 2004 H1
Front Fog Light2003 – 2004 H3-55W
Back Up Light2003 – 2004 921
Brake2003 – 2004 7443
Dome Light2003 – 2004 194
2018 DE3175
Front Side Marker2003 – 2004 12961
Front Turn Signal2003 – 2004 2357
License Plate2003 – 2004 12961
Parking Light2003 – 2004 2357NA
Rear Turn Signal2003 – 2004 7440NA
Tail Light2003 – 2004 7443
Center High Mount Stop Light2003 – 2004 921
Courtesy2003 – 2004 12961
Map Light2003 – 2004 12961
2018 DE3175
Trunk2003 – 2004 12256
2018 194
Low Beam Headlight2006 – 2008 H1
2014 – 2017 H11
2009 – 2013 H7
High Beam Headlight2011 – 2017 9005
2006 – 2008 H1
2009 – 2010 H9
Front Fog Light2006 – 2017 H8/H11/H16
Back Up Light2014 – 2017 7440
2006 – 2013 921
Brake2009 – 2013 3057
2006 – 2008 7443
Daytime Running Light2014 – 2017 9005
Dome Light2006 – 2008 194
2009 – 2017 DE3175
Front Side Marker2006 – 2013 194
2014 – 2017 7444NA
Front Turn Signal2006 – 2008 2357NA
2014 – 2017 7443NA
2009 – 2013 7444NA
License Plate2014 – 2017 12961
2006 – 2013 194
Parking Light2009 – 2013 7443NA
2014 – 2017 7444NA
Rear Side Marker2014 – 2017 12961
2009 – 2013 3057
Rear Turn Signal2009 – 2013 3757NA
2014 – 2017 7440NA
Tail Light2009 – 2013 3057
2006 – 2008 7443
Courtesy2006 – 2017 12961
Inner Tail Light2014 – 2017 194
Map Light2006 – 2008 12961
2014 – 2017 DE3175
Trunk2011 – 2017 194
Low Beam Headlight2006 – 2013 D2S
High Beam Headlight2011 – 2013 9005
2006 – 2008 H1
2009 – 2010 H9
High Beam and Low Beam Headlight2014 – 2015 D4S
Front Fog Light2006 – 2015 H8/H11/H16
Back Up Light2014 – 2015 7440
2006 – 2013 921
Brake2006 – 2008 7443
Dome Light2006 – 2008 194
2009 – 2015 DE3175
Front Side Marker2006 – 2013 194
2014 – 2015 7444NA
Front Turn Signal2006 – 2008 2357NA
2009 – 2015 7444NA
License Plate2014 – 2015 12961
2006 – 2013 194
Parking Light2009 – 2013 7443NA
Rear Side Marker2014 – 2015 194
Rear Turn Signal2009 – 2013 3757NA
2014 – 2015 7440NA
Tail Light2006 – 2008 7443
Courtesy2006 – 2008 12961
2009 – 2015 194
Inner Tail Light2014 – 2015 12961
Map Light2006 – 2008 12961
2014 – 2015 DE3175
Trunk2011 – 2015 194
Low Beam Headlight2005 H1
High Beam Headlight2005 H1
Front Fog Light2005 H3-55W
Back Up Light2005 921
Brake2005 7443
Dome Light2005 194
Front Side Marker2005 12961
Front Turn Signal2005 2357NA
License Plate2005 12961
Parking Light2005 2357NA
Rear Turn Signal2005 7440NA
Tail Light2005 7443
Center High Mount Stop Light2005 921
Courtesy2005 12961
Map Light2005 12961
Low Beam Headlight2005 H1
High Beam Headlight2005 H1
Front Fog Light2005 H3-55W
Back Up Light2005 7440
Brake2005 7443
Dome Light2005 194
Front Side Marker2005 12961
Front Turn Signal2005 2357NA
License Plate2005 12961
Parking Light2005 2357NA
Rear Turn Signal2005 7440
Tail Light2005 7443
Center High Mount Stop Light2005 921
Courtesy2005 12961
Map Light2005 12961
Low Beam Headlight2005 H1
High Beam Headlight2005 H1
Front Fog Light2005 H3-55W
Back Up Light2005 921
Brake2005 7443
Dome Light2005 194
Front Side Marker2005 12961
Front Turn Signal2005 2357NA
License Plate2005 12961
Parking Light2005 2357NA
Rear Turn Signal2005 7440NA
Tail Light2005 7443
Center High Mount Stop Light2005 7440
Courtesy2005 12961
Map Light2005 12961