I have never seen these connectors anywhere. What I did was just cut the existing wires running from the case power button to the MB, and wired the cabinet power button in parallel to the case power button. I also put a 2-pin male/female connection in line with the cab power button, so if I need to remove the PC to work on it, I can just unplug it from the cab power button, and still be able to turn the PC on and off with the reguar power button.