This is the
long knob used on Beetle and Karmann Ghia with the padded dashboard, on Type3
68- and on Type 4.It is for
both the light and wiper switch, but comes with a cap for the light that is not
quite the correct model.
You can
easily remove this for use as a windscreen wiper switch and replace it at the
light switch for the more correct cap BBT 0636-962.