Wikipedia says, that in September 2006 a DVD-edition with all "Dudu"-movies was released:
http://de.wikipedia.org/wiki/Dudu

Wikipedia is not correct. Only in the first episode it was a VW 1300 (with an M-plate from München), in the later ones it was a 1303 (with a DU-DU-plate).

btw. It's popular for VW-fans in the town of Duisburg to have a DU-DU on their Käfer. I've seen some with this combination.