For anyone with this type of Mud flap: Warning
a Poster in the T6 forum advised that his old van had these fitted, the front leading edge at the bottom of the doors started to rust!
it was due to the door rubbing on the plastic Mud flap
Various other posters confirmed the same thing.
I checked on mine today, the Gap between the bottom of the door and the top of the mud flaps where the sit over the cill is very small, possibly touching.
There has been no damage to the paint on the door edge in the short time I have had them fitted, but as a precaution I removed the front ones.
As a precaution I may adjust them by removing some of the plastic to resolve any potential future issue with the door rubbing on the plastic (or I may leave them off)
also when removing the Fronts I was aware that the void was full of sludge
and water so I will probably add a couple of decent size drainage holes
where they will not be visible.
I cannot find the thread in the T6 forum now which is typical, I will post a link if I find it.
edit screen shot of the post, and the thread link, there are more discussion