When doing replacement or upgrading on 2003 – 2018 Cadillac CTS Base Luxury Performance Premium V Vsport Coupe Sedan Wagon 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 Headlight2003 – 2007 9006XS
2008 – 2013 H11
High Beam Headlight2003 – 2007 9005XS
2008 – 2013 H9
Front Fog Light2003 – 2007 9145
2008 – 2013 H8/H11/H16
Back Up Light2003 – 2007 3157
Brake2003 – 2007 3157
Daytime Running Light2003 – 2007 3157
Dome Light2008 – 2013 194
2003 – 2007 PC168
Front Side Marker2003 – 2013 194
Front Turn Signal2008 – 2013 PSY24NA
License Plate2003 – 2007 12961
2008 – 2013 194
Parking Light2003 – 2007 12961
2008 – 2013 194
Rear Side Marker2003 – 2007 12961
Rear Turn Signal2003 – 2007 3157
Tail Light2003 – 2007 3157
Front Inner Turn Signal2003 – 2007 3157
Front Outer Turn Signal2003 – 2007 12961
Center High Mount Stop Light2003 – 2007 PC168
Glove Box2008 – 2013 906
Interior Door2008 – 2013 912
Map Light2003 – 2013 PC168
Stepwell2008 – 2013 12961
Trunk2003 – 2007, 2013 211-2
2008 – 2012 578
Low Beam Headlight2003 – 2007 D1S
High Beam Headlight2003 – 2007 9005XS
High Beam and Low Beam Headlight2008 – 2013 D1S
Front Fog Light2003 – 2007 9145
2008 – 2013 H8/H11/H16
Back Up Light2003 – 2007 3157
Brake2003 – 2007 3157
Daytime Running Light2003 – 2007 3157
2008 – 2013 PS19W
Dome Light2008 – 2013 194
2003 – 2007 PC168
Front Side Marker2003 – 2013 194
Front Turn Signal2008 – 2013 HPC24NA
License Plate2003 – 2007 12961
2008 – 2013 194
Parking Light2003 – 2007 12961
Rear Side Marker2003 – 2007 12961
Rear Turn Signal2003 – 2007 3157
Tail Light2003 – 2007 3157
Front Inner Turn Signal2003 – 2007 3157
Front Outer Turn Signal2003 – 2007 12961
Center High Mount Stop Light2003 – 2007 PC168
Glove Box2008 – 2013 906
Interior Door2008 – 2013 912
Map Light2003 – 2013 PC168
Stepwell2008 – 2013 12961
Trunk2003 – 2007 211-2
2008 – 2013 578
High Beam and Low Beam Headlight2016 – 2018 D3S
Back Up Light2016 – 2018 921
Dome Light2016 – 2018 194
License Plate2016 – 2018 12961
Glove Box2016 – 2018 906
Interior Door2016 – 2018 906
Map Light2016 – 2018 PC168
Stepwell2016 – 2018 12961
Trunk2016 – 2018 578
High Beam and Low Beam Headlight2015 D3S
Back Up Light2015 921
Dome Light2015 194
License Plate2015 12961
Glove Box2015 906
Interior Door2015 906
Map Light2015 PC168
Stepwell2015 12961
Trunk2015 578
High Beam and Low Beam Headlight2015 D1S
Front Fog Light2015 H8/H11/H16
Daytime Running Light2015 PS19W
Dome Light2015 194
Front Side Marker2015 194
Front Turn Signal2015 HPC24NA
License Plate2015 194
Glove Box2015 906
Interior Door2015 912
Map Light2015 PC168
Stepwell2015 12961
Trunk2015 578
High Beam and Low Beam Headlight2014 D3S
Back Up Light2014 921
Dome Light2014 194
License Plate2014 12961
Glove Box2014 906
Interior Door2014 906
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 12961
Parking Light2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 12961
Parking Light2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 12961
Parking Light2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 12961
Parking Light2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D3S
Front Fog Light2014 H8/H11/H16
Back Up Light2014 921
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 12961
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D3S
Back Up Light2014 921
Dome Light2014 194
License Plate2014 12961
Glove Box2014 906
Interior Door2014 906
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D3S
Back Up Light2014 921
Dome Light2014 194
License Plate2014 12961
Glove Box2014 906
Interior Door2014 906
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D3S
Back Up Light2014 921
Dome Light2014 194
License Plate2014 12961
Glove Box2014 906
Interior Door2014 906
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 211-2
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
Low Beam Headlight2014 H11
High Beam Headlight2014 H9
Front Fog Light2014 H8/H11/H16
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 PSY24NA
License Plate2014 194
Parking Light2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578
High Beam and Low Beam Headlight2014 D1S
Front Fog Light2014 H8/H11/H16
Daytime Running Light2014 PS19W
Dome Light2014 194
Front Side Marker2014 194
Front Turn Signal2014 HPC24NA
License Plate2014 194
Glove Box2014 906
Interior Door2014 912
Map Light2014 PC168
Stepwell2014 12961
Trunk2014 578