Amazon.com: 2001-2006 Chevy Silverado/GMC Sierra HD Crew Cab Dual 10 Downfire Subwoofer Box : Electronics
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
Custom Fits Nissan Titan 04-12 Kicker King Crew Cab Truck Dual 10" Sub Box - Walmart.com
2003-2006 CHEVROLET SILVERADO 1500 CREW Triple sub box - SSA STORE
1999-2006 Chevy Silverado or GMC Sierra Full Size Truck Extended Cab Dual 10" Downfiring Sub Box - 2X10GMNEW
Dual 12" Ported Subwoofer Sub Box for 2004-2006 GMC/Chevy Crew Cab Non-HD