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Qpower Dual 8" Ported Empty Woofer Enclosure for GMC/Chevy 2007-Newer Crew CabFits 2007-2020 Genral Motors Crew cab pickup trucksUnderseat Front FireFinished with Durable Bed LinerAir Space:0.8 Cubic Feet (per sub)Mounting Depth: 11.25"Tuning Frequency: 35HZDimensions: 49"L x 13"D x 9"TH/6.5"BH (top and bottom height).