LAB SlapBox™ 1.30 ft^3 Ported MDF Enclosure Box for Single Alpine 10" R-Series Subwoofer
Sealed / Recessed Sub Box for (2 12") Alpine Type R Subs - Subwoofer Enclosure | eBay
Alpine SBR-S8-4 Enclosed Type R 8" Car Subwoofer in Ported Sub Enclosure SBRS8-4 | Audio Savings
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Amazon.com: Alpine ALP19-R-W12D2x2wKit Car Audio Type R Dual 2 Ohm 1500 Watt 12" Subwoofers with Sub Install Kit and HA-SWKD Dual Sub Box Install Kit - 16 Screws and Speaker Wire with
Alpine R-SB12V Halo Series 12" linkable ported subwoofer enclosure at Crutchfield