Looking at the brochures we have available here:- Eriba Sales Literature part 1
and paying particular attention to the German brochures for 1999, 2000, 2001 and 2002, the photos show the striped vans right through to 2001 and the yellow Puck up to 2002. However, there are also photos of the white and silver vans in 2000, 2001 and then in 2002 they are in the forefront (apart fron the Puck).
It's worth noting that in the 2000 and 2001 brochures, the layout plans are listed as either Classic or GT and also the bigger vans, Tritons and Trolls are listed by their classic "letters" and their new "numbers", eg. Triton BSA/430GT and Troll T/530 GT. which suggests they were selling both styles.
Interestingly, the then new "Future" appears in the brochures too and the "smooth skinned" classic van like Islay's appears in the 1999 brochure yet I believe Islay's van is a year earlier.
It's as we though, there is no simple cut off date between changes of models which must have made life very interesting on the shop floor
Randa