2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Walmart.com
SBR-S8-4 - Alpine 8" Single Ported Enclosure Loaded with Type-R Subwoofer
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
Custom Ported Subwoofer Box Enclosure for 2 12" Alpine Type R Subs - R-Series | eBay
Alpine R-SB12V Halo Series 12" linkable ported subwoofer enclosure at Crutchfield
Box I built a couple months back. Alpine type R 10” 1.5cf at 33hz : r/CarAV
Building a Ported Box for a 12" Alpine Type R - YouTube
Alpine SWR-12D2 3000 Watt Type R Car Subwoofer + Vented Sub Enclosure Box | Audio Savings
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
Custom Sub Enclosure | Affordable Sub Box
Alpine 10” Type-R Thin Powered Sealed Bass Package Includes one Alpine SWR-T10 10” thin subwoofer, one R-A75M amplifier, and sealed enclosure
Amazon.com: Universal Car Stereo Slotted S Port Single 12" Alpine R-W12D4 Type R Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
Bass Package: Dual 12" Type-R Series Subwoofers w/ Ported Enclosure
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
12' Alpine Type R in ported box | 3D Warehouse
Alpine Audio 10" Type R & Type X Custom Aero Ported Box X-W10D4 R-W10D4 R-W10D2 | eBay
Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Universal Car Stereo Vented Enclosure Single 12" Alpine R2-W12D4 Type – absoluteusa