We bought new speakers for our Suburban and we did not need the Adapter. 
  • 1 pair of 6.5 in. or 6.75 in. speaker adapters
  • Vehicle-specific fit:
  • Buick(R);2008 to 2015 ENCLAVE;2006 to 2011 LUCERNE
  • Cadillac(R);2007 to 2014 ESCALADE;2007 to 2014 ESCALADE ESV;2007 to 2014 ESCALADE EXT
  • Chevrolet(R);2007 to 2013 AVALANCHE;2012 to 2015 CAPTIVA SPORT;2005 to 2010 COBALT;2008 to 2015 EXPRESS VAN;2006 to 2011 HHR;2008 to 2015 MALIBU;2007 to 2015 SILVERADO;2014 to 2015 SILVERADO HD;2012 to 2015 SONIC;2007 to 2015 SUBURBAN;2007 to 2015 TAHOE;2009 to 2015 TRAVERSE
  • GMC(R);2007 to 2015 ACADIA;2008 to 2015 SAVANA VAN;2007 to 2015 SIERRA;2014 to 2015 SIERRA HD;2007 to 2015 YUKON;2007 to 2015 YUKON DENALI;2007 to 2015 YUKON XL
  • HUMMER(R);2008 to 2009 H2;2006 to 2010 H3;2009 to 2010 H3T
  • Pontiac(R);2007 to 2010 G5;2005 to 2009 G6
  • Saturn(R);2007 to 2009 OUTLOOK
 You will recieve one of the 2 pictured.