Mishimoto Black LS Swap Silicone Radiator Hose Kit developed a new Mazda RX7 FD silicone hose kit for the LS1 V8 motor. The RX7 FD with LS Swap silicone hose kits are made with a dual layer combining high grade silicone and heat-resistant embedded fibers to provide efficient heat reduction and increased pressure tolerance, all with a direct OEM replacement fit.