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 Headlight 2009 – 2017 H11
High Beam Headlight 2009 – 2012 9005
2013 – 2017 H7
Back Up Light 2009 – 2012 912
2013 – 2017 921
Brake 2009 – 2017 7443
Front Side Marker 2009 – 2012 194
2013 – 2017 7444NA
Front Turn Signal 2009 – 2012 4157NA
2013 – 2017 7444NA
License Plate 2013 – 2017 12961
Parking Light 2009 – 2012 4157NA
2013 – 2017 7444NA
Rear Side Marker 2013 – 2017 7443
2009 – 2012 PC161
Rear Turn Signal 2013 – 2017 7440NA
2009 – 2012 7443
Tail Light 2009 – 2017 7443
Luggage Compartment 2009 – 2017 6411
Glove Box 2009 – 2017 194
Map Light 2009 – 2017 194
Low Beam Headlight 2018 H11
High Beam Headlight 2018 H7
High Beam and Low Beam Headlight 2018 D3S
Front Fog Light 2018 PSX24W
Back Up Light 2018 921
Brake 2018 7443
Front Side Marker 2018 7444NA
Front Turn Signal 2018 7443NA
License Plate 2018 12961
Parking Light 2018 7444NA
Rear Side Marker 2018 7443
Rear Turn Signal 2018 7440NA
Tail Light 2018 7443
Luggage Compartment 2018 6411
Glove Box 2018 194
Map Light 2018 168