ASC Chevy Silverado or GMC Sierra 1500 Non-HD Crew Cab Truck 2001-2006 Single 10" Subwoofer Vented Custom Fit Sub Box Speaker Enclosure Dimensions: Width 32-1/4" x Height 18" x Top Depth 3-1/2" x Bottom Depth 7" Install Location: Behind Rear Seat Install Notes: No Modifications Required Mounting Depth: 4-3/4 Inches Air Space: 1.90 Cubic Feet