R & T Enterprises 10in Dual Down-Fire Chevy/GMC Extended Cab Empty Enclosure 49.5" width x 12.25" deep x 7" tall Holds dual 10" sub woofers (Downfire) - speaker mounting depth 5 3/4" Premium MDF with "Tri-lock" joint construction Sealed Enclosure Designed for: GM 1500 Siverado/Sierra Extended Cab 1988-2007 Classic (DOES NOT FIT HD MODELS)