Empty Sub Boxes. - Kick Panels. Fit 99-06 Chevy Silverado Ext Cab Alpine S-W12D4 Single 12 Sub Box HA-A800.1 Amp Compatible with 1999-2006 Chevy Silverado Extended Cab Truck Alpine Type S S-W12D4 Single 12 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit.
eBay