Empty Sub Boxes. - Kick Panels. Fits 02-09 GMC Envoy SUV Alpine S-W12D4 Single 12" Sub Box & HA-A800.1 Amp Compatible with 2002-2009 GMC Envoy SUV Alpine Type S S-W12D4 Single 12" Custom Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit.
eBay