I had the same problem... went from store to store buying different
parts, threaded pipe, round casing etc. to enable me to (re)install the
fixture. There was a round hole and a 1/2 inch square bar that ran
across the middle of it, along with the wires, one black and one white.
I finally got it up, and it hasn't fallen yet.... more then a month,
but I still have my fingers crossed. (smile) It looks like it should be