Bassforms BF210AE Dual 10" Custom Fiberglass Enclosure for 2000-2013 Chevrolet Avalanche/2002-2013 Cadillac EXT Trucks Dual 10" Custom Fiberglass Enclosure For 2000-2013 Chevrolet Avalanche/2002-2013 Cadillac EXT Trucks Mounts under rear seat: Will also fit 4 door GMC trucks with slight modification to rear seat Accommodation for amplifier mounting Airspace: .95 / Speaker Depth: 5.5