My wife and I bought a vintage American Standard(#102 22 87) wall mount sink at a local salvage store. It came with the metal legs, but seemed to be missing the bracket for mounting it to the wall. I also noticed that the back of the sink lacked any visible place for the brackets to hook to. We had a similar sink at another house and it had a metal bracket, two L-shaped pieces of metal, this one has none. What is the proper way to mount this sink to the wall? Any help is appreciated.