Chevy Silverado/GMC Sierra Ext Extended Cab Single 10" Subwoofer Enclosure Sub Box 1999-2006 Chevy Silverado/ GMC Sierra Extended Cab 1999-2006 Down-Firing (Fits Under Rear Seats), Single 10" Enclosure Volume (Cubic Feet Per Chamber): .90 Cu. Feet/ Mounting Depth: 6" High Quality Terminal Cups (accepts Banana Plugs or Bare Wire Quality Gray Wrapping Carpet Dimensions: 23-1/2W x 9-1/2 FH x 7 RH x 13-1/2 D This Enclosure Fits: 1999-2006 Chevy Silverado Extended Cab (Fits 2007 Classic Body)/ 1999-2006 GMC Sierra Extended Cab (2007 Classic Body)