Bbox A182-12Cp Dual 12" Sealed Carpeted Subwoofer Enclosure - Fits 2007 - 2013 Chevrolet / GMC Silverado / Sierra Crew Cab Cutout Diameter - 11.125" Max Mounting Depth - 6.5" Net Volume - 2.07" (Front Height) 6.75" x (Rear Height) 4.5" x (Width) 52.5" x (Depth) 17.75" x (2nd Depth) 17.5" Premium Charcoal Carpet Fits 2007 and Up GM Crew Cab MDF Construction Completely Carpeted Enclosure With Rounded Edges 0.75-inch Speaker Baffles Custom Built for Under Seat Application