Rockville 12" Sub Box for 1999-2006 Chevy Silverado 1500 Xcab/99-06 GMC Sierra
2006 GMC Sierra Speakers — CARiD.com
JL Audio 1999-2006 Chevrolet Silverado / GMC Sierra Crew Cab Trucks & Early 2007 Crew Cab “Classic” Trucks Subwoofer Stealthbox | Audio Express | Western United States
2003-2007 Chevrolet Silverado and GMC Sierra extended cab