Kicker Comp 05C12 12" 4-ohm subwoofer at Crutchfield
Kicker COMP 12" SUBWOOFER 4-OHM 43C124/D - Oikos Center
Amazon.com: Kicker Bundle Compatible with Universal Vehicle C12 Comp Single 12" Vented Port Loaded Sub Box with Harmony HA-400.1 Amp & Install Kit : Electronics