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Amazon.com: 2007-2013 Chevy Silverado/GMC Sierra Crew Cab Quad 8 Front Fire Subwoofer Box : Electronics
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SPL Boxes SB182-212BL Custom-fit dual 12" sealed subwoofer enclosure — fits 2007-2013 Chevy Silverado and GMC Sierra Crew Cab trucks at Crutchfield
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