What are these plastic wedges for? (Rear seat storage)

I was cleaning out my garage and I came across some plastic pieces that I labeled "Tacoma". I don't remember what these are for, they came with my truck. I found an image in another thread, link below. What are the wedges used for and also the circular piece?

Image credit to this thread
https://www.tacomaworld.com/threads/installed-leds-in-rear-seat-storage-very-happy.426582/

 

According to this owner manual
https://assets.sia.toyota.com/publications/en/om-s/OM35862U/pdf/OM35862U.pdf#page=254&zoom=100,0,0

Those are just separator tabs for cargo management and the round thing is a flashlight holder - they can be moved around or removed entirely