The new combination has a closed rail, which is why a new base support was needed. I was happy with the brand so far, the choice fell back to Thule (WingBar, footpacks, mounting kit).
What a step backwards!
The new roof rack must be secured awkward with 8 Allen screws using the supplied Allen key to the vehicle. After that are still loose covers to install the lock cylinders. Very awkward handling.
I will use the cooling off period and looking for an alternative and return the Thule sentence, if I find something better from Blanc or Mercedes.