I have a used Westfalia KmH.
The instructions say that the dampers have to be replaced with others with the part number 441 807 337 "D" (series is "E"), because the clutch comes with 5mm thick material between the Holm and the damper and the bumper thus back/overstands around it in the wheel box and under the chrome strip.
Is that absolutely necessary or is there something else???