2U Universal Vented Rack Mount Cantilever Shelf for 19 Servers
[CABSHELFV]

5 of 5 Stars This shelf is perfect, I couldn't find the right mount for our tower server in the office and bought one of these instead, its great, fits perfectly, comes with everything you need and makes the server cage look tidy. I can tell you it uses two holes on the rail (hence -2U) and it allows wires to fit behind it (16 inch deep in a 19 inch closed rack). It comes with high quality mounting hardware (screws and nuts) and feels very solid. Great strong shelf!