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 Headlight 2003 – 2004 H1
High Beam Headlight 2003 – 2004 H1
Front Fog Light 2003 – 2004 H3-55W
Back Up Light 2003 – 2004 921
Brake 2003 – 2004 7443
Dome Light 2003 – 2004 194
2018 DE3175
Front Side Marker 2003 – 2004 12961
Front Turn Signal 2003 – 2004 2357
License Plate 2003 – 2004 12961
Parking Light 2003 – 2004 2357NA
Rear Turn Signal 2003 – 2004 7440NA
Tail Light 2003 – 2004 7443
Center High Mount Stop Light 2003 – 2004 921
Courtesy 2003 – 2004 12961
Map Light 2003 – 2004 12961
2018 DE3175
Trunk 2003 – 2004 12256
2018 194
Low Beam Headlight 2006 – 2008 H1
2014 – 2017 H11
2009 – 2013 H7
High Beam Headlight 2011 – 2017 9005
2006 – 2008 H1
2009 – 2010 H9
Front Fog Light 2006 – 2017 H8/H11/H16
Back Up Light 2014 – 2017 7440
2006 – 2013 921
Brake 2009 – 2013 3057
2006 – 2008 7443
Daytime Running Light 2014 – 2017 9005
Dome Light 2006 – 2008 194
2009 – 2017 DE3175
Front Side Marker 2006 – 2013 194
2014 – 2017 7444NA
Front Turn Signal 2006 – 2008 2357NA
2014 – 2017 7443NA
2009 – 2013 7444NA
License Plate 2014 – 2017 12961
2006 – 2013 194
Parking Light 2009 – 2013 7443NA
2014 – 2017 7444NA
Rear Side Marker 2014 – 2017 12961
2009 – 2013 3057
Rear Turn Signal 2009 – 2013 3757NA
2014 – 2017 7440NA
Tail Light 2009 – 2013 3057
2006 – 2008 7443
Courtesy 2006 – 2017 12961
Inner Tail Light 2014 – 2017 194
Map Light 2006 – 2008 12961
2014 – 2017 DE3175
Trunk 2011 – 2017 194
Low Beam Headlight 2006 – 2013 D2S
High Beam Headlight 2011 – 2013 9005
2006 – 2008 H1
2009 – 2010 H9
High Beam and Low Beam Headlight 2014 – 2015 D4S
Front Fog Light 2006 – 2015 H8/H11/H16
Back Up Light 2014 – 2015 7440
2006 – 2013 921
Brake 2006 – 2008 7443
Dome Light 2006 – 2008 194
2009 – 2015 DE3175
Front Side Marker 2006 – 2013 194
2014 – 2015 7444NA
Front Turn Signal 2006 – 2008 2357NA
2009 – 2015 7444NA
License Plate 2014 – 2015 12961
2006 – 2013 194
Parking Light 2009 – 2013 7443NA
Rear Side Marker 2014 – 2015 194
Rear Turn Signal 2009 – 2013 3757NA
2014 – 2015 7440NA
Tail Light 2006 – 2008 7443
Courtesy 2006 – 2008 12961
2009 – 2015 194
Inner Tail Light 2014 – 2015 12961
Map Light 2006 – 2008 12961
2014 – 2015 DE3175
Trunk 2011 – 2015 194
Low Beam Headlight 2005 H1
High Beam Headlight 2005 H1
Front Fog Light 2005 H3-55W
Back Up Light 2005 921
Brake 2005 7443
Dome Light 2005 194
Front Side Marker 2005 12961
Front Turn Signal 2005 2357NA
License Plate 2005 12961
Parking Light 2005 2357NA
Rear Turn Signal 2005 7440NA
Tail Light 2005 7443
Center High Mount Stop Light 2005 921
Courtesy 2005 12961
Map Light 2005 12961
Low Beam Headlight 2005 H1
High Beam Headlight 2005 H1
Front Fog Light 2005 H3-55W
Back Up Light 2005 7440
Brake 2005 7443
Dome Light 2005 194
Front Side Marker 2005 12961
Front Turn Signal 2005 2357NA
License Plate 2005 12961
Parking Light 2005 2357NA
Rear Turn Signal 2005 7440
Tail Light 2005 7443
Center High Mount Stop Light 2005 921
Courtesy 2005 12961
Map Light 2005 12961
Low Beam Headlight 2005 H1
High Beam Headlight 2005 H1
Front Fog Light 2005 H3-55W
Back Up Light 2005 921
Brake 2005 7443
Dome Light 2005 194
Front Side Marker 2005 12961
Front Turn Signal 2005 2357NA
License Plate 2005 12961
Parking Light 2005 2357NA
Rear Turn Signal 2005 7440NA
Tail Light 2005 7443
Center High Mount Stop Light 2005 7440
Courtesy 2005 12961
Map Light 2005 12961