Alpine Audio 10" Type R & Type X Custom Aero Ported Box X-W10D4 R-W10D4 R-W10D2 | eBay
Universal Car Stereo Slotted S Port Single 10" Alpine Bundle Type R R-W10D4 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com
LAB SlapBox™ 1.30 ft^3 Ported MDF Enclosure Box for Single Alpine 10" R-
Alpine R2-W10D4 10" 750w Car Subwoofer+Vented Sub Box+Mono Amplifier+Amp Kit - Walmart.com
2) Alpine R2-W10D2 10" Type-R 750w Car Audio Subwoofers+Vented Sub Box Enclosure - Rockville Audio