Amazon.com: Universal Regular Cab Truck Alpine S-W12D2 Type S Car Audio Subwoofers Custom Dual 12" Sub Box Enclosure Package : Electronics
2 Alpine Type R R-W12D4 12" Sub up Port Back Subwoofer Box Plans | CustomLowz
Alpine RS-SB10 | Pacific Stereo
Universal Car Stereo Single 12" Alpine Bundle Type S S-W12D4 Bundle with Rearfire Sealed Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com
Alpine Jeep Wrangler Single 12-Inch Alpine Halo R-Series Preloaded Subwoofer Enclosure with ProLink R2-SB12V (Universal; Some Adaptation May Be Required) - Free Shipping
LAB SlapBox™ 2.00 ft^3 Ported MDF Enclosure Box for Single Alpine 12" S-Series Subwoofer