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 Headlight2015 D3S
Front Fog Light2015 H8/H11/H16
Back Up Light2015 921
Front Turn Signal2015 PWY24WNAHTR
Luggage Compartment2015 194
Glove Box2015 194
Interior Door2015 194
Map Light2015 12961
Rear Fog Light2015 921
Rear Reading Light2015 12961
High Beam and Low Beam Headlight2016 – 2018 D5S
Back Up Light2016 – 2018 921
Front Turn Signal2016 – 2018 PWY24WNAHTR
Luggage Compartment2016 – 2018 194
Glove Box2016 – 2018 194
Interior Door2016 – 2018 194
Map Light2016 – 2018 12961
Rear Fog Light2016 – 2018 921
Rear Reading Light2016 – 2018 12961
High Beam and Low Beam Headlight2015 – 2017 D3S
Front Fog Light2015 – 2017 H8/H11/H16
Back Up Light2015 – 2017 921
Dome Light2015 – 2017 578
Front Turn Signal2015 – 2017 PSY24NA
Rear Side Marker2015 – 2017 12256
Luggage Compartment2015 – 2017 12961
Glove Box2015 – 2017 12256
Interior Door2015 – 2017 194
Map Light2015 – 2017 12961
Rear Fog Light2015 – 2017 921
Rear Reading Light2015 – 2017 194
High Beam and Low Beam Headlight2009 – 2014 D3S
2018 D5S
Front Fog Light2009 – 2014, 2018 H8/H11/H16
Back Up Light2009 – 2014, 2018 921
Brake2009 – 2014 1156
Dome Light2013 – 2014, 2018 578
2009 – 2012 DE3423
Front Turn Signal2009 – 2012 HPC24NA
2013 – 2014 PSY24NA
2018 PWY24WNAHTR
License Plate2009 – 2012 12844
Rear Side Marker2009 – 2014, 2018 12256
Rear Turn Signal2009 – 2014 PY21W
Tail Light2009 – 2012 1156
Luggage Compartment2009 – 2014, 2018 12961
Glove Box2009 – 2014 12256
2018 12961
Interior Door2009 – 2014, 2018 194
Map Light2009 – 2014, 2018 12961
Rear Fog Light2018 921
Rear Reading Light2018 194
Low Beam Headlight2009 – 2014 H7
High Beam Headlight2009 – 2014 H7
Front Fog Light2009 – 2014 H8/H11/H16
Back Up Light2009 – 2014 921
Brake2009 – 2014 1156
Daytime Running Light2009 – 2014 P13W
Dome Light2013 – 2014 6411
2009 – 2012 DE3423
Front Side Marker2009 – 2014 12961
Front Turn Signal2009 – 2012 HPC24NA
2013 – 2014 PSY24NA
License Plate2009 – 2012 12844
Rear Side Marker2009 – 2014 12256
Rear Turn Signal2009 – 2014 PY21W
Tail Light2009 – 2012 1156
Luggage Compartment2009 – 2014 12961
Glove Box2009 – 2014 12256
Interior Door2009 – 2014 194
Map Light2009 – 2014 12961
High Beam and Low Beam Headlight2013 – 2015 D3S
Front Fog Light2013 – 2015 H8/H11/H16
Back Up Light2013 – 2015 921
Dome Light2013 – 2015 6411
Rear Side Marker2013 – 2015 12256
Luggage Compartment2013 – 2015 194
Glove Box2013 – 2015 194
Interior Door2013 – 2015 194
Rear Fog Light2013 – 2015 921
Stepwell2013 – 2015 12961
High Beam and Low Beam Headlight2007 – 2009 D1S
2010 – 2012 D3S
2017 – 2018 D5S
Front Fog Light2007 – 2009 H7
2010 – 2012 H8/H11/H16
Back Up Light2007 – 2012, 2017 – 2018 921
Brake2007 – 2012 1156
Daytime Running Light2007 – 2009 1156
Dome Light2010 – 2012 6411
Front Side Marker2007 – 2009 12256
Front Turn Signal2007 – 2009 H21W
2017 – 2018 PWY24WNAHTR
License Plate2007 – 2009 12844
2010 – 2012 6418
Parking Light2007 – 2009 12396NA
Rear Side Marker2007 – 2012, 2017 – 2018 12256
Rear Turn Signal2007 – 2012 1156
Tail Light2007 – 2009 1156
Luggage Compartment2007 – 2009 12961
2010 – 2012 194
Courtesy2007 – 2012 12961
Glove Box2007 – 2009 12961
2010 – 2012 194
Interior Door2017 – 2018 194
Rear Fog Light2017 – 2018 921
Low Beam Headlight2007 – 2012 H7
High Beam Headlight2010 – 2012 H15
2007 – 2009 H7
Front Fog Light2007 – 2009 H7
2010 – 2012 H8/H11/H16
Back Up Light2007 – 2012 921
Brake2007 – 2012 1156
Daytime Running Light2010 – 2012 H15
Dome Light2010 – 2012 578
Front Side Marker2007 – 2009 12256
2010 – 2012 12961
Front Turn Signal2007 – 2012 H21W
License Plate2007 – 2012 12844
Parking Light2007 – 2009 12396NA
2010 – 2012 194
Rear Side Marker2007 – 2012 12256
Rear Turn Signal2007 – 2012 1156
Tail Light2007 – 2009 1156
Luggage Compartment2007 – 2012 12961
Courtesy2007 – 2012 12961
Glove Box2007 – 2012 12961