My apologies for not being clearer.
The Foam Trim sits underneath the two Carpeted side trims, the wheel arch covers, over the Wheel arch covers are the "L" Shaped Plastic Trims.
To get the Foam trim fitted:-
Lift the Middle floor section up, the bit to get to the Tool kit. At each side are the Wheel Arch covers, to the floor are several screws, I think its 3 each side from Memory. Undo these and lift the Wheel arch covers as high as you can whilst sliding the foam trim section under. The Foam trim has to go over some Metal lugs if you will, you will see these with the Foam kit out
If there is enough daylight after work tomorrow, I will have a look on my Tourer and see if I can get Pictures for you
In order to remove the Wheelarch Covers completely is a Mammoth task, you have to remove the Loadspace Board, which entails removing the Rear Seat rests !!!!!!
I don't know where you live? Are you local to me? I am in Bilston, West Midlands? If you are local I can pop round next week and have a look for you as I am off work for two weeks starting Friday
P.S Can you post a bigger picture for us to see? Looking at the small one, it looks like they are fitted ok, but cannot be sure