ASC Ford Mustang Coupe 1994-2004 Dual 12" Subwoofer Custom Fit Sub Box Speaker Enclosure Dimensions: Width 48-3/4" x Height 9-3/4" x Top Depth 13-3/8" x Bottom Depth 11" Install Location: Behind Rear Seat in Trunk Install Notes: Does Not fit Convertible. Mustangs equipped with the Mach system - you need to relocate the amp rack that's under the rear dash for box to fit. Mounting Depth: 8 Inches Air Space: 0.80 Cubic Feet