2 Pair 12" MDF Wood Speaker Subwoofer Mounting Spacer Rings Recessed with Bezel - Best Connections, Inc.
Single 12" Subwoofer Regular Standard Cab Truck Sub Box Enclosure 5/8" MDF | 112TRUCK
Amazon.com: Q Power QBASS Dual 10 Inch Heavy Duty MDF Material Car Audio Subwoofer Enclosure Boxes with Shared Slot Port Vent and Dual Chamber Design, Charcoal : Electronics
Car Audio Single 10 Ported 3/4 MDF Subwoofer Enclosure Speaker Bass Sub Box - Walmart.com
LAB PreFab™ Ported MDF Enclosure Box for Single 10" Round Car Subwoofer