593-0493 922-8194 Sensor Cable, Optical Temp - 2.4-2.66GHz iMac Early 2008 - 20inch 2.0-2.4 Mid2007 NB-3223W This is a replacement temperature sensor for the optical drive on the Intel iMac 17" and 20" released in late 2006. The cable is included. Apple part number: 922-8194, 593-0493