I think what you are seeing in that diagram is two views of the same hitch and I think it's the mule drive for the parallel hitch. One is shown together and one apart with the items called out. Do you have the parallel hitch set up? If your deck lifts the same in the front as it does in the back, that's what you have. If your deck only lifts in the back, then you don't and you need the mule drive that I have. I have some pictures somewhere of my mule drive. I'll see if I can find them.