When doing replacement or upgrading on 2009 – 2018 Mazda 3 Sport 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 Headlight2010 – 2018 H11
2009 H7
High Beam Headlight2009 – 2018 9005
Back Up Light2009 – 2018 7440
Brake2010 – 2018 7443
Daytime Running Light2010 – 2013 7443
2014 – 2018 9005
Dome Light2009 – 2018 DE3175
Front Side Marker2009 1157NA
2014 – 2018 12396NA
2010 – 2013 7444NA
Front Turn Signal2009 1157
2014 – 2018 7440NA
2010 – 2013 7443NA
License Plate2010 – 2013 12961
2009, 2014 – 2018 194
Parking Light2009 1157
2014 – 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 Light2009 12961
2010 – 2018 DE3175
Low Beam Headlight2009 D2S
High Beam Headlight2009 9005
High Beam and Low Beam Headlight2010 – 2013 D2S
2014 – 2016 D4S
Front Fog Light2014 – 2016 H8/H11/H16
Back Up Light2009 – 2016 7440
Daytime Running Light2010 – 2013 H8
Dome Light2009 – 2016 DE3175
Front Side Marker2009 1157NA
2014 – 2016 194
2010 – 2013 7444NA
Front Turn Signal2009 1157
2014 – 2016 7440NA
2010 – 2013 7444NA
License Plate2010 – 2013 12961
2009, 2014 – 2016 194
Parking Light2009 1157
2010 – 2013 194
Rear Turn Signal2010 – 2016 7440NA
Luggage Compartment2010 – 2016 DE3022
Map Light2009 12961
2010 – 2016 DE3175