Front wheel arch inserts

[prm]

A daft question i know but half the insert is outside the arch and the rest on the inside on my w211 57 reg, should the plastic be under the front lip on the arch or on the outside of the arch rim, ta

 

[st4]

Mine is like that. I suspect all of it inside but cannot be sure.

 

[Alps]

mine was like that when i got my car, pushed it in but same bit popped out again , as *** said it should be inside.