When doing replacement or upgrading on 2007 – 2012 Mazda CX-7 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 Headlight2007 – 2012 H7
High Beam Headlight2007 – 2012 9005
Front Fog Light2007 – 2012 H8/H11/H16
Back Up Light2007 – 2012 7440
Brake2007 – 2012 7443
Dome Light2007 – 2012 DE3175
Front Side Marker2007 – 2011 12961
2012 168
Front Turn Signal2007 – 2011 1157
2012 7443NA
License Plate2007 – 2011 12961
2012 168
Parking Light2007 – 2011 1157
2012 7444NA
Rear Side Marker2007 – 2011 12961
2012 168
Rear Turn Signal2007 – 2012 7440NA
Tail Light2007 – 2012 7443
Luggage Compartment2007 – 2012 DE3175
Map Light2007 – 2011 12961
2012 168
Low Beam Headlight2007 – 2012 D2S
High Beam Headlight2007 – 2012 9005
Front Fog Light2007 – 2012 H8/H11/H16
Back Up Light2007 – 2012 7440
Brake2007 – 2012 7443
Dome Light2007 – 2012 DE3175
Front Side Marker2007 – 2011 12961
2012 168
Front Turn Signal2007 – 2011 1157
2012 7443NA
License Plate2007 – 2011 12961
2012 168
Parking Light2007 – 2011 1157
2012 7444NA
Rear Side Marker2007 – 2011 12961
2012 168
Rear Turn Signal2007 – 2012 7440NA
Tail Light2007 – 2012 7443
Luggage Compartment2007 – 2012 DE3175
Map Light2007 – 2011 12961
2012 168