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 Headlight2004 – 2009 H7
High Beam Headlight2004 – 2009 9005
Front Fog Light2004 – 2006 H8/H11/H16
Back Up Light2004 – 2009 7440
Brake2004 – 2006 7443
Dome Light2004 – 2009 DE3175
Front Side Marker2004 – 2009 1157NA
Front Turn Signal2007 – 2009 1157
License Plate2004 – 2006 12961
2007 – 2009 194
Parking Light2004 – 2009 1157
Rear Turn Signal2004 – 2006 7440
Tail Light2004 – 2006 7443
Front Inner Turn Signal2004 – 2006 1157NA
Front Outer Turn Signal2004 – 2006 12396NA
Center High Mount Stop Light2004 – 2006 921
Map Light2004 – 2009 12961
Trunk2004 – 2006 194
Low Beam Headlight2004 – 2009 D2S
High Beam Headlight2004 – 2009 9005
Front Fog Light2004 – 2006 H8/H11/H16
Back Up Light2004 – 2009 7440
Brake2004 – 2006 7443
Dome Light2004 – 2009 DE3175
Front Side Marker2004 – 2009 1157NA
Front Turn Signal2007 – 2009 1157
License Plate2004 – 2006 12961
2007 – 2009 194
Parking Light2004 – 2009 1157
Rear Turn Signal2004 – 2006 7440
Tail Light2004 – 2006 7443
Front Inner Turn Signal2004 – 2006 1157NA
Front Outer Turn Signal2004 – 2006 12396NA
Center High Mount Stop Light2004 – 2006 921
Map Light2004 – 2009 12961
Trunk2004 – 2006 194
Low Beam Headlight2010 – 2018 H11
High Beam Headlight2010 – 2018 9005
Back Up Light2010 – 2013 7440
2014 – 2018 921
Brake2010 – 2018 7443
Daytime Running Light2010 – 2013 7443
2014 – 2018 9005
Dome Light2010 – 2018 DE3175
Front Side Marker2014 – 2018 12396NA
2010 – 2013 7444NA
Front Turn Signal2014 – 2018 7440NA
2010 – 2013 7443NA
License Plate2010 – 2013 12961
2014 – 2018 194
Parking Light2014 – 2018 12396NA
2010 – 2013 12961
Rear Side Marker2010 – 2018 7443
Rear Turn Signal2010 – 2013 7440
2014 – 2018 7440NA
Tail Light2010 – 2018 7443
Center High Mount Stop Light2010 – 2013 7440
Map Light2010 – 2018 DE3175
Trunk2010 – 2018 194
High Beam and Low Beam Headlight2010 – 2013 D2S
2014 – 2016 D4S
Front Fog Light2014 – 2016 H8/H11/H16
Back Up Light2010 – 2013 7440
2014 – 2016 921
Daytime Running Light2010 – 2013 H8
Dome Light2010 – 2016 DE3175
Front Side Marker2014 – 2016 194
2010 – 2013 7444NA
Front Turn Signal2014 – 2016 7440NA
2010 – 2013 7444NA
License Plate2010 – 2013 12961
2014 – 2016 194
Parking Light2010 – 2013 194
Rear Turn Signal2010 – 2016 7440NA
Center High Mount Stop Light2010 – 2013 7440
Map Light2010 – 2016 DE3175
Trunk2010 – 2016 194
Low Beam Headlight2010 – 2018 H11
High Beam Headlight2010 – 2018 9005
Back Up Light2010 – 2018 7440
Brake2010 – 2018 7443
Daytime Running Light2010 – 2013 7443
2014 – 2018 9005
Dome Light2010 – 2018 DE3175
Front Side Marker2014 – 2018 12396NA
2010 – 2013 7444NA
Front Turn Signal2014 – 2018 7440NA
2010 – 2013 7443NA
License Plate2010 – 2013 12961
2014 – 2018 194
Parking Light2014 – 2018 12396NA
2010 – 2013 12961
Rear Side Marker2010 – 2018 7443
Rear Turn Signal2010 – 2013 7440
2014 – 2018 7440NA
Tail Light2010 – 2018 7443
Luggage Compartment2010 – 2018 DE3022
Center High Mount Stop Light2010 – 2013 921
Map Light2010 – 2018 DE3175
High Beam and Low Beam Headlight2010 – 2013 D2S
2014 – 2016 D4S
Front Fog Light2014 – 2016 H8/H11/H16
Back Up Light2010 – 2016 7440
Daytime Running Light2010 – 2013 H8
Dome Light2010 – 2016 DE3175
Front Side Marker2014 – 2016 194
2010 – 2013 7444NA
Front Turn Signal2014 – 2016 7440NA
2010 – 2013 7444NA
License Plate2010 – 2013 12961
2014 – 2016 194
Parking Light2010 – 2013 194
Rear Turn Signal2010 – 2016 7440NA
Luggage Compartment2010 – 2016 DE3022
Map Light2010 – 2016 DE3175