Empty Sub Boxes. - Kick Panels. Fit 07-13 Chevy Silverado Ext Cab Alpine S-W12D4 Single 12 Sub Box HA-A800.1 Amp Compatible with 2007-2013 Chevy Silverado Extended Cab Truck Alpine Type S S-W12D4 Single 12 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit.
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