Fits 1999-2006 GMC Sierra Ext Cab Truck Alpine S-W12D4 Type S Single 12" Sub Box
Empty Sub Boxes. - Kick Panels. Fits 1999-2006 GMC Sierra Ext Cab Truck Alpine S-W12D4 Type S Single 12" Sub Box 1999-2006 GMC Sierra Ext Cab Truck Alpine Type S S-W12D4 Single 12" Sub Box Enclosure - Final 2 Ohm.