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SPL Boxes SB152-212BL Custom-fit dual 12" sealed subwoofer enclosure — fits 1999-2006 Chevy Silverado and GMC Sierra Extended Cab trucks at Crutchfield
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DUAL 12 SPEAKER BOX 2001-2006 Chevy Silverado 1500 Crew cab and GMC Sierra 1500 Crew (non heavy duty series) - Sound Off Audio, Inc.
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Q POWER GMC Chevy Silverado Crew Cab 2007-2013 Underseat 12 in. Subwoofer Sub Box (2-Pack) 2 x GMC12-2007-4DR - The Home Depot
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2014-2019 Chevy Silverado & GMC Sierra Double Cab Subwoofer Box | 1500 & 2500 - AudioDesigns CG Store
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Amazon.com: Harmony Audio R124 Dual 12" Sub Box Enclosure Compatible with 2007-2013 Chevy Silverado Ext Cab Truck : Electronics
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Amazon.com: LOMENTICSLOMENTICS99-06 Chevy Silverado/GMC Sierra Regular Cab Dual 10 Subwoofer Box with Amp Space : Electronics
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