You're the only one that has been avid looking for the diagrams, and judging by the extent of help, you're not going to get much better.
If you're constructing something, the best bet is to build your own. If something requires that product and nothing else, then you're stuck buying it. If not, make something to fit your needs. Even if you contruct your own, it's not going to be as precise as that bracket, so think of your options, or else do a lot more googling. If there's nothing on that website, then there probably will be nothing elsewhere.