• Fits 2007 and up Chevy Silverado Extended Cab.
• New body style
• Armor Coated With High Pressure Polyurethane Bed Liner Material
• Increases The Base, stiffens the wood and no air leaks
• 2-10'' Speakers
• Down Firing Systems.
• Air Volume .66 Cubic Feet Per Side
• Mounting Depth 5.5''
• Material 5/8'' M.D.F

Picture showing installation of the carpeted type , it would fit the same for poly box.