I would guess you'll need a new ignition barrel, ignition switch and possibly a new steering cowl. There are various sources for a new barrel and switch, there's a few ebay dealers that do them, or you could try somewhere like TPS if not your local VW dealer themselves... The steering cowls are more than likely obsolete now (try TPS though to see) so either a breaker on here or an ebay search is your best bet.
HTH
Mark