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 Headlight 2003 – 2007 9006XS
2008 – 2013 H11
High Beam Headlight 2003 – 2007 9005XS
2008 – 2013 H9
Front Fog Light 2003 – 2007 9145
2008 – 2013 H8/H11/H16
Back Up Light 2003 – 2007 3157
Brake 2003 – 2007 3157
Daytime Running Light 2003 – 2007 3157
Dome Light 2008 – 2013 194
2003 – 2007 PC168
Front Side Marker 2003 – 2013 194
Front Turn Signal 2008 – 2013 PSY24NA
License Plate 2003 – 2007 12961
2008 – 2013 194
Parking Light 2003 – 2007 12961
2008 – 2013 194
Rear Side Marker 2003 – 2007 12961
Rear Turn Signal 2003 – 2007 3157
Tail Light 2003 – 2007 3157
Front Inner Turn Signal 2003 – 2007 3157
Front Outer Turn Signal 2003 – 2007 12961
Center High Mount Stop Light 2003 – 2007 PC168
Glove Box 2008 – 2013 906
Interior Door 2008 – 2013 912
Map Light 2003 – 2013 PC168
Stepwell 2008 – 2013 12961
Trunk 2003 – 2007, 2013 211-2
2008 – 2012 578
Low Beam Headlight 2003 – 2007 D1S
High Beam Headlight 2003 – 2007 9005XS
High Beam and Low Beam Headlight 2008 – 2013 D1S
Front Fog Light 2003 – 2007 9145
2008 – 2013 H8/H11/H16
Back Up Light 2003 – 2007 3157
Brake 2003 – 2007 3157
Daytime Running Light 2003 – 2007 3157
2008 – 2013 PS19W
Dome Light 2008 – 2013 194
2003 – 2007 PC168
Front Side Marker 2003 – 2013 194
Front Turn Signal 2008 – 2013 HPC24NA
License Plate 2003 – 2007 12961
2008 – 2013 194
Parking Light 2003 – 2007 12961
Rear Side Marker 2003 – 2007 12961
Rear Turn Signal 2003 – 2007 3157
Tail Light 2003 – 2007 3157
Front Inner Turn Signal 2003 – 2007 3157
Front Outer Turn Signal 2003 – 2007 12961
Center High Mount Stop Light 2003 – 2007 PC168
Glove Box 2008 – 2013 906
Interior Door 2008 – 2013 912
Map Light 2003 – 2013 PC168
Stepwell 2008 – 2013 12961
Trunk 2003 – 2007 211-2
2008 – 2013 578
High Beam and Low Beam Headlight 2016 – 2018 D3S
Back Up Light 2016 – 2018 921
Dome Light 2016 – 2018 194
License Plate 2016 – 2018 12961
Glove Box 2016 – 2018 906
Interior Door 2016 – 2018 906
Map Light 2016 – 2018 PC168
Stepwell 2016 – 2018 12961
Trunk 2016 – 2018 578
High Beam and Low Beam Headlight 2015 D3S
Back Up Light 2015 921
Dome Light 2015 194
License Plate 2015 12961
Glove Box 2015 906
Interior Door 2015 906
Map Light 2015 PC168
Stepwell 2015 12961
Trunk 2015 578
High Beam and Low Beam Headlight 2015 D1S
Front Fog Light 2015 H8/H11/H16
Daytime Running Light 2015 PS19W
Dome Light 2015 194
Front Side Marker 2015 194
Front Turn Signal 2015 HPC24NA
License Plate 2015 194
Glove Box 2015 906
Interior Door 2015 912
Map Light 2015 PC168
Stepwell 2015 12961
Trunk 2015 578
High Beam and Low Beam Headlight 2014 D3S
Back Up Light 2014 921
Dome Light 2014 194
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 906
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 12961
Parking Light 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 12961
Parking Light 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 12961
Parking Light 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 12961
Parking Light 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D3S
Front Fog Light 2014 H8/H11/H16
Back Up Light 2014 921
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D3S
Back Up Light 2014 921
Dome Light 2014 194
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 906
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D3S
Back Up Light 2014 921
Dome Light 2014 194
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 906
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D3S
Back Up Light 2014 921
Dome Light 2014 194
License Plate 2014 12961
Glove Box 2014 906
Interior Door 2014 906
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 211-2
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
Low Beam Headlight 2014 H11
High Beam Headlight 2014 H9
Front Fog Light 2014 H8/H11/H16
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 PSY24NA
License Plate 2014 194
Parking Light 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578
High Beam and Low Beam Headlight 2014 D1S
Front Fog Light 2014 H8/H11/H16
Daytime Running Light 2014 PS19W
Dome Light 2014 194
Front Side Marker 2014 194
Front Turn Signal 2014 HPC24NA
License Plate 2014 194
Glove Box 2014 906
Interior Door 2014 912
Map Light 2014 PC168
Stepwell 2014 12961
Trunk 2014 578