OBCON Dual 10-Inch Chevy Ext. Cab 1988 - 2006 Speaker Box With Labyrinth Power Port 51 1/8" wide x 15 1/8" deep x 9 1/2" tall Holds dual 10" sub woofers (Downfire) - speaker mounting depth 5 3/4" Premium MDF with "Tri-lock" joint construction Labyrinth slot vent design Designed for: GM 1500 Siverado/Sierra Extended Cab 1988 - 2007 Classic (DOES NOT FIT HD MODELS)