![Amazon.com: 1999-2006 Silverado/Sierra Extended Cab Dual 12 Downfire Ultra MAXX Subwoofer Box : Electronics Amazon.com: 1999-2006 Silverado/Sierra Extended Cab Dual 12 Downfire Ultra MAXX Subwoofer Box : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71FbgoY-zqL._AC_UF350,350_QL50_.jpg)
Amazon.com: 1999-2006 Silverado/Sierra Extended Cab Dual 12 Downfire Ultra MAXX Subwoofer Box : Electronics
![DUAL 12 SPEAKER BOX 2001-2006 Chevy Silverado 1500 Crew cab and GMC Sierra 1500 Crew (non heavy duty series) - SSA STORE DUAL 12 SPEAKER BOX 2001-2006 Chevy Silverado 1500 Crew cab and GMC Sierra 1500 Crew (non heavy duty series) - SSA STORE](https://cdn11.bigcommerce.com/s-a6ac4/images/stencil/728x728/products/4964/16654/GMCREW1500__87186__27524.1564766910.jpg?c=2)
DUAL 12 SPEAKER BOX 2001-2006 Chevy Silverado 1500 Crew cab and GMC Sierra 1500 Crew (non heavy duty series) - SSA STORE
![Amazon.com: Compatible with Chevy Silverado 99-06 Extended Cab Truck Dual 12" Kicker C12 Subwoofer Sub Box Enclosure 600 Watts Peak : Electronics Amazon.com: Compatible with Chevy Silverado 99-06 Extended Cab Truck Dual 12" Kicker C12 Subwoofer Sub Box Enclosure 600 Watts Peak : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61dxCXLRRnL.jpg)
Amazon.com: Compatible with Chevy Silverado 99-06 Extended Cab Truck Dual 12" Kicker C12 Subwoofer Sub Box Enclosure 600 Watts Peak : Electronics
![Amazon.com: Harmony Audio R124 Dual 12" Sub Box Enclosure Compatible with 2007-2013 Chevy Silverado Ext Cab Truck : Electronics Amazon.com: Harmony Audio R124 Dual 12" Sub Box Enclosure Compatible with 2007-2013 Chevy Silverado Ext Cab Truck : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/51fHRYCM8VL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Harmony Audio R124 Dual 12" Sub Box Enclosure Compatible with 2007-2013 Chevy Silverado Ext Cab Truck : Electronics
![Amazon.com: American Sound Connection ASC 1X10GMNEW Compatible with 99-06 Chevy Silverado Extended Cab Custom 10" Subwoofer Box : Electronics Amazon.com: American Sound Connection ASC 1X10GMNEW Compatible with 99-06 Chevy Silverado Extended Cab Custom 10" Subwoofer Box : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71d0H7B3IDL._AC_UF894,1000_QL80_.jpg)
Amazon.com: American Sound Connection ASC 1X10GMNEW Compatible with 99-06 Chevy Silverado Extended Cab Custom 10" Subwoofer Box : Electronics
![Amazon.com: 1999-2006 Silverado/Sierra Extended Cab Dual 10 Downfire with Amp Space Sub Box : Health & Household Amazon.com: 1999-2006 Silverado/Sierra Extended Cab Dual 10 Downfire with Amp Space Sub Box : Health & Household](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61hImKw2klL._AC_UF1000,1000_QL80_.jpg)