Yes,
those were accessory items, that fitted over the opening lever on the 1/4 windows....
I think they were mainly made for holdens etc that did NOT have the push button lock on them...
I always thought the push button on the lever would stop theives from breaking in....
but they are very crafty nowa days...
there would be cheap ways of doing it like screwing a bracket etc to stop the 1/4 windows from opening
but they would look bad and stop You from opening the windows...
Maybe you should look at a cheap alarm system...
a siren alarm with a key switch in front of the door hinge..
like the last Beetles made in Mexico....
when the door is opened the alarm will sound for 3 minutes...
check Dick Smiths etc...
best of Luck
Lee
http://community.webshots.com/user/vw68autobug
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---