Thanks to all who contributed to this thread.
I found the same piece of debris at the same location on my 1997 LC.
As a bonus, I also found a blockage which I have yet to resolve in the body penetrating fitting immediately before the sprayer head. It may be some debris from a earlier, failed...
Dealer-maintained FZJ80 Land Cruiser with 1FZ-FE engine has about 100K city/highway miles. I took it to a non-dealer to have PHH replaced. They had to remove the Air Intake Manifold (upper and lower) to replace the PHH (which was bulging and leaking) with an Xtreme Silicone Pesky Heater Hose...