BassForms BF1124RUN Single 12" Custom Fiberglass Enclosure for 2003-2007 Toyota 4Runner without 3rd Row Seat Single 12" Custom Fiberglass Enclosure For 2003-2007 Toyota 4Runner without 3rd Row Seat Mounts seamlessly into right side corner space of cargo area Constructed with 4 layers of 2oz. Matting: 100% Fiberglass Airspace: .92 / Speaker Depth: 7.87