Chevy Silverado Ext. Cab 99-06 Dual Underseat 12" Subwoofer Sub Enclosure Box

Bbox A152-12CP Dual Sealed 12-Inch Down Firing Subwoofer Enclosure for GM Extended Cabs 1999-2007

ASC Chevy Silverado or GMC Sierra Full Size Extended Cab Truck 2007-2013 Dual 12" Subwoofer Custom Fit Sub Box Speaker Enclosure

OBCON Dual 12-Inch Chevy Ext. Cab 1999 - 2006 Speaker Box With Labyrinth Power Port

OBCON Dual 10" Chevy 1500 Extended Cab 2008 - 2011 Speaker Box With Labyrinth Power Port

R/T Dual 12-Inch Chevy Ext. Cab 1999 - 2006 Sealed Speaker Box

R/T Dual 10-Inch Chevy 1500 Extended Cab 2008 - 2011 Sealed Speaker Box

American Sound Connection GM2X12-CREW07+ 12-Inch GM/Chevy Crew Cab 2003 - 2007 (Dual)

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