Obcon Single 10-Inch Chevy Extension Cab 1988 - 2006 Speaker Box with Labyrinth Power Port 28.5" width x 15 1/8" deep x 9 1/2" tall Holds a single 10" sub woofer (Downfire) - speaker mounting depth 5 3/4" Premium MDF with "Tri-lock" joint construction Labyrinth slot vent design Designed for: GM 1500 Extended Cab Silverado/Sierra 1997-2008 (DOES NOT FIT HD MODELS)