When doing replacement or upgrading on 2009 – 2018 Chevrolet Traverse with HID headlamps, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2009 – 2017 H11
High Beam Headlight2009 – 2012 9005
2013 – 2017 H7
Back Up Light2009 – 2012 912
2013 – 2017 921
Brake2009 – 2017 7443
Front Side Marker2009 – 2012 194
2013 – 2017 7444NA
Front Turn Signal2009 – 2012 4157NA
2013 – 2017 7444NA
License Plate2013 – 2017 12961
Parking Light2009 – 2012 4157NA
2013 – 2017 7444NA
Rear Side Marker2013 – 2017 7443
2009 – 2012 PC161
Rear Turn Signal2013 – 2017 7440NA
2009 – 2012 7443
Tail Light2009 – 2017 7443
Luggage Compartment2009 – 2017 6411
Glove Box2009 – 2017 194
Map Light2009 – 2017 194
Low Beam Headlight2018 H11
High Beam Headlight2018 H7
High Beam and Low Beam Headlight2018 D3S
Front Fog Light2018 PSX24W
Back Up Light2018 921
Brake2018 7443
Front Side Marker2018 7444NA
Front Turn Signal2018 7443NA
License Plate2018 12961
Parking Light2018 7444NA
Rear Side Marker2018 7443
Rear Turn Signal2018 7440NA
Tail Light2018 7443
Luggage Compartment2018 6411
Glove Box2018 194
Map Light2018 168