If you're missing the cap/lock, that style is no longer available.  The
newer style is much easier to use, and is available from Euro American RV.
As far as making a key for the existing ones, I make them all the time at VW
shows, and have never run into any that are the same.  They are easy to make
a key for though.  Your local locksmith should be able to do it (Ilco 1092C
is the correct key blank) or I can make them if someone wants to ship me the
lock.  I've also had people ask if it can be re-keyed to match the ignition
or gas cap key.  Sorry, but it can't.
Steve Sandlin
www.steveslockshop.com
'84 Wolfsburg Westy
'79 Transporter
'00 New Beetle