Pro tip: Add some silicone adhesive to the door at the speaker opening prior to installing. Doing so will hold the speaker in place while you bolt in and also serves as an buffer to absorb some of the vibration of the speaker once installed. Good quality ABS materials designed. Appropriate thickness, anti-cracker to reduce vibration that keep the best sound effects. Adapter is line up that fit into original slots. Adapters allow you to upgrade your factory/OE speakers to 6.5 inch or 6.75 inch aftermarket speaker. NO extra drilling just bolted right in to keep that OEM look. Replacement for GMC: Colorado 2010-2020, Acadia 2007-2020, Savana Van 2008-2020, Sierra 2007-2020, Sierra HD 2014-2020, Yukon/Yukon Denali/Yukon XL 2007-2020, Hummer H2 2008-2009, Hummer H3 2006-2010, Hummer H3T 2009-2010, Pontiac G5 2007-2010, Pontiac G6 2005-2009, Saturn Outlook 2007-2009. Cadillac :Escalade/ESV/EXT 2007-2020. Speaker wire need please search: RED WOLF GMC speaker wire harness. Compatible with:Chevrolet: Avalanche 2007-2020, Captiva Sport 2012-2020, Cobalt 2005-2010, Express Van 2008-2018, HHR 2006-2011, Malibu 2008-2015, Silverado 2007-2022, Silverado HD 2014-2019, Sonic 2012-2016, Suburban 2007-2020, Tahoe 2007-2020, Traverse 2009-2020, 2006-2020 Chevy Impala. Buick: Enclave 2008-2017, Lucerne 2006-2011, 2008-2011 Regal,2015 Lacrosse, 2019-2020 Envision.