Chevy Silverado / GMC Sierra Ext Extended Cab Dual 12" Subwoofer Enclosure Sub Box 2007-2013- CARB COMPLIANT MDF! DONT BUY CHEAPER NON COMPLIANT MDF! Chevy Silverado/ GMC Sierra Extended Cab 2007-2013 Down-Firing (Fits Under Rear Seats), Dual 12" Enclosure Volume (Cubic Feet Per Chamber): .60 Cu. Feet/ Mounting Depth: 5" High Quality Terminal Cups (accepts Banana Plugs or Bare Wire)/ Quality Black Wrapping Carpet Dimensions: 55-3/4W x 8-3/4 FH x 5 RH x 14-3/4 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)