DUAL 12 SPEAKER BOX 2001-2006 Chevy Silverado 1500 Crew cab and GMC Sierra 1500 Crew (non heavy duty series) - Sound Off Audio, Inc.
Chevy Silverado Crew Cab Sub Box GMC Sierra Crew Cab Sub Box Sub
Amazon.com: Compatible with 2001 2002 2003 2004 2005 2006 Chevy Silverado HD Crew Truck Alpine S-W12D2 Type S Car Audio Subwoofers Custom Dual 12" Sub Box Enclosure Package : Electronics