Well, obviously, from the five, the German version is the easiest one to track down, since German singles are regularly offered on the internet and record fairs. 'Dann kamst du' turned up on the recent record fair in Utrecht, and in a mint picture cover too.
My collection: 7" single no. 5745
Found: Record fair, Utrecht, April 11, 2015
Cost: 1 euro
Tracks: 'Dann kamst du (Après toi)' / 'Alles, was ich hab'