JL Audio 12TW3-D4 Shallow-mount 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alphasonik AS12DF 12" Down Fire Shallow Mount Flat Enclosure | Alphasonik
Q Power ED12 S Flat 12-Inch Dual Hatchback Subwoofer Box (2 Pack)
Q Power Deluxe 10 Inch Shallow Mount 1000 Watt Flat Car Subwoofer (2 Pack) - Walmart.com
Pioneer TS-A3000LS4 - 12" Shallow-Mount Subwoofer with 1,500 Watts Max. Power - Walmart.com
Amazon.com: Alphasonik AS12DF 12" 1500 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure :