RT/OBCON - 2005 Chevy Silverado and GM Sierra 2500/3500 Crew Cab Dual 10" Sealed Speaker Box (behind the seat) Designed for: 2005 Chevy Silverado 2500/3500 and GM Sierra 2500/3500 Crew Cab 48 1/4" wide x 10 5/8" tall x 5 1/4" top depth x 7 3/4" bottom depth Solid 5/8" material with "Tri-lock" joint construction Speaker mounting depth: 5 3/4" - Air Volume: 1.2cf Dual 10" sealed enclosure (fits behind the back seat)