ASC Chevy Silverado or GMC Sierra 1500 Non-HD Crew Cab Truck 2001-2006 Dual 12" Subwoofer Custom Fit Sub Box Speaker Enclosure Dimensions: Width 48-1/4" x Height 14" x Top Depth 3-1/2" x Bottom Depth 6-1/2" Install Location: Behind Rear Seat Install Notes: Relocation or Removal of Jack is required Mounting Depth: 4-1/2 Inches Air Space: 0.60 Cubic Feet