What are these?

[tnanlal Lurker Find all posts View Profile Close tnanlal]

I can't seem to figure what are these and what fits here?

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Mounting points for a retention system?

[Guest Close Guest]

Tracks to fit tie down points. Usually seen in Kakadus.

[starbuck76 Senior Member Find all posts View Profile Close starbuck76]

And VX's

Edit. Google "BMW Tie-Down Ring for Trunk" part number 51-47-7-146-024