Where do I find the power adapter for my Cinema Display?

I have recently aquired an older style of an Apple Cinema display. It didn't come with a power adapter, just the DVI cable coming out the back. I have done some research and understand that power and usb and video signal come through this one cable, but I have also come to know there is supposed to be a converter power box type thing between the display and the monitor. I can find boxes similar to the one I believe I need on Ebay and other sites, but not the exact one. They vary in style somewhat. Wondering if someone could steer me in the direction of where to get one and help me understand more of what I need and how it all works? The model/serial number on the monitor is CY3041XSLFA, it's a 23" Cinema HD Display, made in 2002. - Thanks -