I'm a locksmith specializing in Volkswagen.  As far as adapting the new
high security key to the Vanagon, I won't say it can't be done, but it is
not really practical.  Due to the construction of the wafers in the new
key, the plug is different.  A machinist could rework the housings of the
Vanagon locks to accept the plug, but it would get expensive.  Also, the
mounting of the tail pieces on the two locks are different.  All in all, it
just is not a practical thing to do, but with enough time and money
anything is possible.  Someone on the list replied that only a dealer could
duplicate the new keys.  This is not true.  There are several key machines
on the market for locksmith use for this type of key.  The machine costs
nearly $1500, and key blanks are in the $8 range when bought in quantities
of 50.  Dupe costs of $35-$50 are not out of line.  Be aware, though, that
cost for the 2000 year model VW keys will be substantially higher, due to
activation of the ignition transponder system, requiring not only a correct
mechanical key, but the correct electronic proramming of the key itself.  I
would not be surprised to see a dupe cost in the neighborhood of $70 for
that.  The transponder blanks are just now becoming available for the 2000
cars, and the programmers are beginning to come on line also.  If I can
answer any other VW lock questions, please post or visit my web site at
http://www.steveslockshop.com.  I am familiar with both of these locks; I
have an '84 Westy and a 2000 New Beetle.  Steve Sandlin