Alpine SWR-T12 Type-R Thin 12" 4-ohm shallow-mount subwoofer at Crutchfield
Alpine Type R 12' SWR1243D Subwoofer | 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
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Amazon.com: Alpine R-W10D4 Car Audio Type R Dual 4 Ohm 1500 Watt 10" Subwoofers with Sub Install Kit Package : Electronics
Alpine Type-R 12" 1000W Subwoofer Black SWR-12D4 - Best Buy
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics