When doing replacement or upgrading on 2007 – 2018 GMC Acadia Limited 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.

Low Beam Headlight2007 – 2012 H11
High Beam Headlight2007 – 2012 H7
High Beam and Low Beam Headlight2013 – 2018 9012
Front Fog Light2013 – 2018 H8/H11/H16
2007 – 2012 PS24WFF
Back Up Light2013 – 2018 921
2007 – 2012 HPC19W
Dome Light2007 – 2016 212-2
Front Side Marker2007 – 2016 194NA
Front Turn Signal2013 – 2018 7444NA
2007 – 2012 HPC24NA
License Plate2007 – 2012 168
2017 – 2018 194
Parking Light2007 – 2012 194
2013 – 2018 7443NA
Rear Turn Signal2017 – 2018 7440
Luggage Compartment2007 – 2009 6411
2013 – 2016 921
Courtesy2007 – 2012 194
Glove Box2007 – 2012 194
Map Light2017 – 2018 12961
2007 – 2016 194
High Beam and Low Beam Headlight2007 – 2012 D1S
2013 – 2018 D3S
Front Fog Light2013 – 2018 H8/H11/H16
2007 – 2012 PS24WFF
Back Up Light2013 – 2018 921
2007 – 2012 HPC19W
Daytime Running Light2007 – 2012 3157
Dome Light2007 – 2016 212-2
Front Side Marker2007 – 2016 194NA
Front Turn Signal2013 – 2018 7444NA
2007 – 2012 HPC24NA
License Plate2007 – 2012 168
2017 – 2018 194
Parking Light2007 – 2012 194NA
2013 – 2018 7443NA
Rear Turn Signal2017 – 2018 7440
Luggage Compartment2007 – 2009 6411
2013 – 2016 921
Courtesy2007 – 2012 194
Glove Box2007 – 2012 194
Map Light2017 – 2018 12961
2007 – 2016 194
High Beam and Low Beam Headlight2017 D3S
Front Fog Light2017 H8/H11/H16
Back Up Light2017 921
Dome Light2017 212-2
Front Side Marker2017 194NA
Front Turn Signal2017 7444NA
Parking Light2017 7443NA
Luggage Compartment2017 921
Map Light2017 194