That diagram didn't help, as I saw it before. Here's the best I can give you from an internet source;
This fitting is seated just behind the higher exhaust pipe nut for the EGR. In this pic, it almost looks like it's touching the seat belt knot. It's an elbow that holds the rubber line that runs under (and into) the throttle body. The other side of the ell is a slip male, not threaded, that attaches to the plenum just behind the EGR mounting bolts.
I could send some of my pics, if someone can post them.
Thanks