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 Headlight 2007 – 2012 H11
High Beam Headlight 2007 – 2012 H7
High Beam and Low Beam Headlight 2013 – 2018 9012
Front Fog Light 2013 – 2018 H8/H11/H16
2007 – 2012 PS24WFF
Back Up Light 2013 – 2018 921
2007 – 2012 HPC19W
Dome Light 2007 – 2016 212-2
Front Side Marker 2007 – 2016 194NA
Front Turn Signal 2013 – 2018 7444NA
2007 – 2012 HPC24NA
License Plate 2007 – 2012 168
2017 – 2018 194
Parking Light 2007 – 2012 194
2013 – 2018 7443NA
Rear Turn Signal 2017 – 2018 7440
Luggage Compartment 2007 – 2009 6411
2013 – 2016 921
Courtesy 2007 – 2012 194
Glove Box 2007 – 2012 194
Map Light 2017 – 2018 12961
2007 – 2016 194
High Beam and Low Beam Headlight 2007 – 2012 D1S
2013 – 2018 D3S
Front Fog Light 2013 – 2018 H8/H11/H16
2007 – 2012 PS24WFF
Back Up Light 2013 – 2018 921
2007 – 2012 HPC19W
Daytime Running Light 2007 – 2012 3157
Dome Light 2007 – 2016 212-2
Front Side Marker 2007 – 2016 194NA
Front Turn Signal 2013 – 2018 7444NA
2007 – 2012 HPC24NA
License Plate 2007 – 2012 168
2017 – 2018 194
Parking Light 2007 – 2012 194NA
2013 – 2018 7443NA
Rear Turn Signal 2017 – 2018 7440
Luggage Compartment 2007 – 2009 6411
2013 – 2016 921
Courtesy 2007 – 2012 194
Glove Box 2007 – 2012 194
Map Light 2017 – 2018 12961
2007 – 2016 194
High Beam and Low Beam Headlight 2017 D3S
Front Fog Light 2017 H8/H11/H16
Back Up Light 2017 921
Dome Light 2017 212-2
Front Side Marker 2017 194NA
Front Turn Signal 2017 7444NA
Parking Light 2017 7443NA
Luggage Compartment 2017 921
Map Light 2017 194