I know what I'm looking for, but I don't know what to call it. I have a light stand with a cross bar with 4 holes to accomodate 4 lights. A band I used to play in had an electrical box with 4 outlets in a metal chassis, a recessed plug on the bottom of it that would plug into an extension cord, and it had a threaded bolt and wingnut so you could mount it into one of the holes in the crossbar. I can't seem to find any online anywhere I look. What would this be called, and where could I find one? Right now, I just use 2 lights, and I have a power strip duct taped to the stand. It looks stupid, so I want to make it right.