When doing replacement or upgrading on 2004 – 2016 Cadillac SRX with capsule halogen headlamps HID, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 2004 – 2009 9006XS
2010 – 2016 H11
High Beam Headlight 2010 – 2016 9005
2004 – 2009 9005XS
Front Fog Light 2004 – 2016 9145
Back Up Light 2004 – 2009 3157
2010 – 2016 HPC16W
Daytime Running Light 2010 – 2016 H11
Dome Light 2010 – 2016 194
2004 – 2009 578
Front Side Marker 2004 – 2009 194
2010 – 2016 7443NA
Front Turn Signal 2004 – 2009 3757NA
License Plate 2010 – 2016 12961
2004 – 2009 194
Parking Light 2004 – 2009 3757NA
2010 – 2016 7443NA
Rear Turn Signal 2010 – 2016 7440
Front Inner Turn Signal 2010 – 2016 7443NA
Front Outer Turn Signal 2010 – 2016 12396NA
Luggage Compartment 2004 – 2009 578
Interior Door 2004 – 2009 906
Map Light 2004 – 2016 12961
Low Beam Headlight 2004 – 2009 D1S
High Beam Headlight 2004 – 2009 9005XS
High Beam and Low Beam Headlight 2010 – 2016 D2S
Front Fog Light 2004 – 2016 9145
Back Up Light 2004 – 2009 3157
2010 – 2016 HPC16W
Daytime Running Light 2010 – 2016 7443
Dome Light 2010 – 2016 194
2004 – 2009 578
Front Side Marker 2004 – 2009 12961
2010 – 2016 7444NA
Front Turn Signal 2004 – 2009 3757NA
License Plate 2010 – 2016 12961
2004 – 2009 194
Parking Light 2004 – 2009 3757NA
2010 – 2016 7443
Rear Turn Signal 2010 – 2016 7440
Front Inner Turn Signal 2010 – 2016 7443NA
Front Outer Turn Signal 2010 – 2016 12396NA
Luggage Compartment 2004 – 2009 578
Interior Door 2004 – 2009 906
Map Light 2004 – 2016 12961