When doing replacement or upgrading on 2004 – 2018 Mazda 3 Hatchback Sedan with capsule halogen headlamps HID, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 2004 – 2009 H7
High Beam Headlight 2004 – 2009 9005
Front Fog Light 2004 – 2006 H8/H11/H16
Back Up Light 2004 – 2009 7440
Brake 2004 – 2006 7443
Dome Light 2004 – 2009 DE3175
Front Side Marker 2004 – 2009 1157NA
Front Turn Signal 2007 – 2009 1157
License Plate 2004 – 2006 12961
2007 – 2009 194
Parking Light 2004 – 2009 1157
Rear Turn Signal 2004 – 2006 7440
Tail Light 2004 – 2006 7443
Front Inner Turn Signal 2004 – 2006 1157NA
Front Outer Turn Signal 2004 – 2006 12396NA
Center High Mount Stop Light 2004 – 2006 921
Map Light 2004 – 2009 12961
Trunk 2004 – 2006 194
Low Beam Headlight 2004 – 2009 D2S
High Beam Headlight 2004 – 2009 9005
Front Fog Light 2004 – 2006 H8/H11/H16
Back Up Light 2004 – 2009 7440
Brake 2004 – 2006 7443
Dome Light 2004 – 2009 DE3175
Front Side Marker 2004 – 2009 1157NA
Front Turn Signal 2007 – 2009 1157
License Plate 2004 – 2006 12961
2007 – 2009 194
Parking Light 2004 – 2009 1157
Rear Turn Signal 2004 – 2006 7440
Tail Light 2004 – 2006 7443
Front Inner Turn Signal 2004 – 2006 1157NA
Front Outer Turn Signal 2004 – 2006 12396NA
Center High Mount Stop Light 2004 – 2006 921
Map Light 2004 – 2009 12961
Trunk 2004 – 2006 194
Low Beam Headlight 2010 – 2018 H11
High Beam Headlight 2010 – 2018 9005
Back Up Light 2010 – 2013 7440
2014 – 2018 921
Brake 2010 – 2018 7443
Daytime Running Light 2010 – 2013 7443
2014 – 2018 9005
Dome Light 2010 – 2018 DE3175
Front Side Marker 2014 – 2018 12396NA
2010 – 2013 7444NA
Front Turn Signal 2014 – 2018 7440NA
2010 – 2013 7443NA
License Plate 2010 – 2013 12961
2014 – 2018 194
Parking Light 2014 – 2018 12396NA
2010 – 2013 12961
Rear Side Marker 2010 – 2018 7443
Rear Turn Signal 2010 – 2013 7440
2014 – 2018 7440NA
Tail Light 2010 – 2018 7443
Center High Mount Stop Light 2010 – 2013 7440
Map Light 2010 – 2018 DE3175
Trunk 2010 – 2018 194
High Beam and Low Beam Headlight 2010 – 2013 D2S
2014 – 2016 D4S
Front Fog Light 2014 – 2016 H8/H11/H16
Back Up Light 2010 – 2013 7440
2014 – 2016 921
Daytime Running Light 2010 – 2013 H8
Dome Light 2010 – 2016 DE3175
Front Side Marker 2014 – 2016 194
2010 – 2013 7444NA
Front Turn Signal 2014 – 2016 7440NA
2010 – 2013 7444NA
License Plate 2010 – 2013 12961
2014 – 2016 194
Parking Light 2010 – 2013 194
Rear Turn Signal 2010 – 2016 7440NA
Center High Mount Stop Light 2010 – 2013 7440
Map Light 2010 – 2016 DE3175
Trunk 2010 – 2016 194
Low Beam Headlight 2010 – 2018 H11
High Beam Headlight 2010 – 2018 9005
Back Up Light 2010 – 2018 7440
Brake 2010 – 2018 7443
Daytime Running Light 2010 – 2013 7443
2014 – 2018 9005
Dome Light 2010 – 2018 DE3175
Front Side Marker 2014 – 2018 12396NA
2010 – 2013 7444NA
Front Turn Signal 2014 – 2018 7440NA
2010 – 2013 7443NA
License Plate 2010 – 2013 12961
2014 – 2018 194
Parking Light 2014 – 2018 12396NA
2010 – 2013 12961
Rear Side Marker 2010 – 2018 7443
Rear Turn Signal 2010 – 2013 7440
2014 – 2018 7440NA
Tail Light 2010 – 2018 7443
Luggage Compartment 2010 – 2018 DE3022
Center High Mount Stop Light 2010 – 2013 921
Map Light 2010 – 2018 DE3175
High Beam and Low Beam Headlight 2010 – 2013 D2S
2014 – 2016 D4S
Front Fog Light 2014 – 2016 H8/H11/H16
Back Up Light 2010 – 2016 7440
Daytime Running Light 2010 – 2013 H8
Dome Light 2010 – 2016 DE3175
Front Side Marker 2014 – 2016 194
2010 – 2013 7444NA
Front Turn Signal 2014 – 2016 7440NA
2010 – 2013 7444NA
License Plate 2010 – 2013 12961
2014 – 2016 194
Parking Light 2010 – 2013 194
Rear Turn Signal 2010 – 2016 7440NA
Luggage Compartment 2010 – 2016 DE3022
Map Light 2010 – 2016 DE3175