SoundBox Chevy Silverado/GMC Sierra Ext Extended Cab Single 12'' Subwoofer Enclosure Sub Box 2007-2013 Chevy Silverado/ GMC Sierra Extended Cab 2007-2013 Down-Firing (Fits Under Rear Seats), Single 12" Enclosure Volume (Cubic Feet Per Chamber): .60 Cu. Feet/ Mounting Depth: 5" High Quality Terminal Cups (accepts Banana Plugs or Bare Wire Quality Gray Wrapping Carpet Dimensions: 26W x 9-1/4 FH x 5-1/4 RH x 13 D This Enclosure Fits: 2007-2013 Chevy Silverado Extended Cab (Does Not Fit 2007 Classic Body)/ 2007-2013 GMC Sierra Extended Cab (Does Not Fit 2007 Classic Body)