Yes, I know all about them , from reading AND seeing them many times, in the British Museum.
As a born & bred Manhattanite, I prictically lived in the Met ; heck, I could tell where dust had fallen and not been cleaned off yet, between my visits. Even after moving to Chicago, I came back and took my kiddo there and relived my own childhood memories. :-)
Do you know when the Met acquired those things ? I don't remember reading about them before I stopped my N.Y. Times subscription and the N.Y. Post has NEVER run an article about the Met getting them. It must be rather recent ... right ?
They got "Human-headed Winged Bull and Winged Lion (Lamassu), ca. 883–859 B.C. Northern Mesopotamian. Alabaster (gypsum). Gift of John D. Rockefeller Jr., 1932", but I do not think they went on display until much later.
The Met has built a special room on the second floor for these treasures. Around the walls of which are the large wall panels. I have a recollection that much after the British Museum put their panels on display someone was doing a thesis on how the British Museum got the panels. This led to a school in England where the additional panels (now at the Met) were thought to be mere copies of what went to the British Museum. But it turned out that they were half of the original amount and not copies. The Met bought them and built the very large display space.