Audio Enhancers GMX125C10 Chevrolet GMC 1500/ 2500HD/ 3500HD Extended Double Cab 2007-2016 Subwoofer Sub Speaker Box Designed for 2007-2016 Chevrolet GMC 1500/ 2500HD/ 3500HD Extended Double Cab Truck Down Firing; Total Air Space 1.25; Per Sub 0.62cu.ft; Mounting Depth 5 3/4"; Carpeted 2-10" Width 53 1/2" x Depth 12 7/8" x Front Height 10 1/4" x Rear Height 6 5/8" See Detail Installation Comments Under Product Description 100% American Made & 100% Green