TRU SPEC Prefab Single 8" Subwoofer Enclosure Box Sundown SA 8" | eBay
Amazon.com: Atrend 8 inch Vented Enclosure Carpeted Car Subwoofer Speaker Box - Improves Audio Quality, Sound and Bass - High Grade MDF Construction with Nickel Finish Speaker Terminal - Black : Electronics
QPower QBFORDFF09408 8 Inch Quad Port Subwoofer Box for Ford F150 and F250/350 - Walmart.com