Fits the models below (Gasoline 5.3L and 6.2L V8 applications only): CADILLAC ESCALADE 2015-2020 EXPRESS 2500 2016-2020 EXPRESS 3500 2016-2020 EXPRESS 4500 2016-2019 SILVERADO 1500 2014-2019 SUBURBAN 2015-2020 TAHOE 2015-2020 GMC SAVANA 2500 2016-2020 GMC SAVANA 3500 2016-2020 GMC SAVANA 4500 2016-2019 GMC SIERRA 1500 2014-2018 GMC YUKON 2015-2020 GMC YUKON XL 2015-2020 Michigan Motorsports 24" Oxygen Sensor Extension Harness Fits Upstream (Front) Sensors on most 2014-2020 GM Truck/SUV 5.3 6.2 Engines *NOTE* On some applications, GM used a different O2 sensor on the left and right sides of the vehicle. PLEASE VERIFY if your engine has the dark gray connector with keyway locations matching the pictures for this harness both sides, or only one side before purchasing.