Amazon.com: 2014-2018 Chevy Silverado/GMC Sierra Crew Cab Dual 10 Downfire with Amp Space Sub Box Charcoal Gray : Electronics
Amazon.com: Compatible with 2014 2015 2016 2017 2018 2019 Chevy Silverado Double Cab Alpine S-W12D2 Type S Car Audio Subwoofers Custom Dual 12" Sub Box Enclosure Package : Electronics
Amazon.com: Compatible with 2014 2015 2016 2017 2018 2019 Chevy Silverado Crew Cab Alpine S-W12D4 Type S Car Audio Subwoofer Custom Single 12" Sub Box Enclosure Package : Electronics
Ported sub box 2007-2013 Chevy Silverado Extended Cab truck
Chevy Silverado Extended Cab 2007-2018 12" Single Sub Box Subwoofer Enclosure | eBay
2014-2018 Chevy Silverado/GMC Sierra Crew Cab Dual 10" Sub Box | Skar Audio