When doing replacement or upgrading on 2007 – 2018 Audi Q7 Q3 Q5 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.

High Beam and Low Beam Headlight 2015 D3S
Front Fog Light 2015 H8/H11/H16
Back Up Light 2015 921
Front Turn Signal 2015 PWY24WNAHTR
Luggage Compartment 2015 194
Glove Box 2015 194
Interior Door 2015 194
Map Light 2015 12961
Rear Fog Light 2015 921
Rear Reading Light 2015 12961
High Beam and Low Beam Headlight 2016 – 2018 D5S
Back Up Light 2016 – 2018 921
Front Turn Signal 2016 – 2018 PWY24WNAHTR
Luggage Compartment 2016 – 2018 194
Glove Box 2016 – 2018 194
Interior Door 2016 – 2018 194
Map Light 2016 – 2018 12961
Rear Fog Light 2016 – 2018 921
Rear Reading Light 2016 – 2018 12961
High Beam and Low Beam Headlight 2015 – 2017 D3S
Front Fog Light 2015 – 2017 H8/H11/H16
Back Up Light 2015 – 2017 921
Dome Light 2015 – 2017 578
Front Turn Signal 2015 – 2017 PSY24NA
Rear Side Marker 2015 – 2017 12256
Luggage Compartment 2015 – 2017 12961
Glove Box 2015 – 2017 12256
Interior Door 2015 – 2017 194
Map Light 2015 – 2017 12961
Rear Fog Light 2015 – 2017 921
Rear Reading Light 2015 – 2017 194
High Beam and Low Beam Headlight 2009 – 2014 D3S
2018 D5S
Front Fog Light 2009 – 2014, 2018 H8/H11/H16
Back Up Light 2009 – 2014, 2018 921
Brake 2009 – 2014 1156
Dome Light 2013 – 2014, 2018 578
2009 – 2012 DE3423
Front Turn Signal 2009 – 2012 HPC24NA
2013 – 2014 PSY24NA
2018 PWY24WNAHTR
License Plate 2009 – 2012 12844
Rear Side Marker 2009 – 2014, 2018 12256
Rear Turn Signal 2009 – 2014 PY21W
Tail Light 2009 – 2012 1156
Luggage Compartment 2009 – 2014, 2018 12961
Glove Box 2009 – 2014 12256
2018 12961
Interior Door 2009 – 2014, 2018 194
Map Light 2009 – 2014, 2018 12961
Rear Fog Light 2018 921
Rear Reading Light 2018 194
Low Beam Headlight 2009 – 2014 H7
High Beam Headlight 2009 – 2014 H7
Front Fog Light 2009 – 2014 H8/H11/H16
Back Up Light 2009 – 2014 921
Brake 2009 – 2014 1156
Daytime Running Light 2009 – 2014 P13W
Dome Light 2013 – 2014 6411
2009 – 2012 DE3423
Front Side Marker 2009 – 2014 12961
Front Turn Signal 2009 – 2012 HPC24NA
2013 – 2014 PSY24NA
License Plate 2009 – 2012 12844
Rear Side Marker 2009 – 2014 12256
Rear Turn Signal 2009 – 2014 PY21W
Tail Light 2009 – 2012 1156
Luggage Compartment 2009 – 2014 12961
Glove Box 2009 – 2014 12256
Interior Door 2009 – 2014 194
Map Light 2009 – 2014 12961
High Beam and Low Beam Headlight 2013 – 2015 D3S
Front Fog Light 2013 – 2015 H8/H11/H16
Back Up Light 2013 – 2015 921
Dome Light 2013 – 2015 6411
Rear Side Marker 2013 – 2015 12256
Luggage Compartment 2013 – 2015 194
Glove Box 2013 – 2015 194
Interior Door 2013 – 2015 194
Rear Fog Light 2013 – 2015 921
Stepwell 2013 – 2015 12961
High Beam and Low Beam Headlight 2007 – 2009 D1S
2010 – 2012 D3S
2017 – 2018 D5S
Front Fog Light 2007 – 2009 H7
2010 – 2012 H8/H11/H16
Back Up Light 2007 – 2012, 2017 – 2018 921
Brake 2007 – 2012 1156
Daytime Running Light 2007 – 2009 1156
Dome Light 2010 – 2012 6411
Front Side Marker 2007 – 2009 12256
Front Turn Signal 2007 – 2009 H21W
2017 – 2018 PWY24WNAHTR
License Plate 2007 – 2009 12844
2010 – 2012 6418
Parking Light 2007 – 2009 12396NA
Rear Side Marker 2007 – 2012, 2017 – 2018 12256
Rear Turn Signal 2007 – 2012 1156
Tail Light 2007 – 2009 1156
Luggage Compartment 2007 – 2009 12961
2010 – 2012 194
Courtesy 2007 – 2012 12961
Glove Box 2007 – 2009 12961
2010 – 2012 194
Interior Door 2017 – 2018 194
Rear Fog Light 2017 – 2018 921
Low Beam Headlight 2007 – 2012 H7
High Beam Headlight 2010 – 2012 H15
2007 – 2009 H7
Front Fog Light 2007 – 2009 H7
2010 – 2012 H8/H11/H16
Back Up Light 2007 – 2012 921
Brake 2007 – 2012 1156
Daytime Running Light 2010 – 2012 H15
Dome Light 2010 – 2012 578
Front Side Marker 2007 – 2009 12256
2010 – 2012 12961
Front Turn Signal 2007 – 2012 H21W
License Plate 2007 – 2012 12844
Parking Light 2007 – 2009 12396NA
2010 – 2012 194
Rear Side Marker 2007 – 2012 12256
Rear Turn Signal 2007 – 2012 1156
Tail Light 2007 – 2009 1156
Luggage Compartment 2007 – 2012 12961
Courtesy 2007 – 2012 12961
Glove Box 2007 – 2012 12961