When doing replacement or upgrading on 2004 – 2018 Chevrolet Colorado with halogen capsule headlamps sealed beam, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2004 – 2006 9006
High Beam Headlight2004 – 2006 9005
Front Fog Light2004 – 2006 H8/H11/H16
Back Up Light2004 – 2006 3057
Brake2004 – 2006 3057
Daytime Running Light2004 – 2006 4157
Dome Light2004 – 2006 561
Front Turn Signal2004 – 2006 3757NA
License Plate2004 – 2006 194
Parking Light2004 – 2006 3757NA
Rear Turn Signal2004 – 2006 3057
Tail Light2004 – 2006 3057
Luggage Compartment2004 – 2006 912
Center High Mount Stop Light2004 – 2006 912
Map Light2004 – 2006 578
High Beam and Low Beam Headlight2004 – 2006 H6054
Back Up Light2004 – 2006 3057
Brake2004 – 2006 3057
Daytime Running Light2004 – 2006 4157
Dome Light2004 – 2006 561
Front Turn Signal2004 – 2006 3757NA
License Plate2004 – 2006 194
Parking Light2004 – 2006 3757NA
Rear Turn Signal2004 – 2006 3057
Tail Light2004 – 2006 3057
Luggage Compartment2004 – 2006 912
Center High Mount Stop Light2004 – 2006 912
Map Light2004 – 2006 578
Low Beam Headlight2007 – 2012 9006
2015 – 2018 H11
High Beam Headlight2007 – 2012, 2015 – 2018 9005
Front Fog Light2009 – 2012 9045
2007 – 2008 H8/H11/H16
2015 – 2018 PS24WFF
Back Up Light2007 – 2012 3057
2015 – 2018 921
Brake2007 – 2012 3057
2015 – 2018 7443
Daytime Running Light2007 – 2012 4157
Dome Light2007 – 2008 561
2009 – 2012 578
Front Side Marker2015 – 2018 194
2009 – 2012 3757NA
Front Turn Signal2007 – 2012 3757NA
2015 – 2018 7444NA
License Plate2009 – 2012 12961
2007 – 2008, 2015 – 2018 194
Parking Light2007 – 2012 3757NA
2015 – 2018 7443NA
Rear Side Marker2009 – 2012 3057
2015 – 2018 7443
Rear Turn Signal2007 – 2012 3057
2015 – 2018 7443
Tail Light2007 – 2012 3057
2015 – 2018 7443
Luggage Compartment2007 – 2012 912
2015 – 2018 921
Center High Mount Stop Light2007 – 2012 912
2015 – 2018 921
Courtesy2009 – 2012 192
Map Light2009 – 2012 212-2
2007 – 2008 578