I have installed the VW factory auxiliary light brackets that David
Marshall has for sale on both my 84 Westy and my sister's 81 Westy.  They
provide a very secure and hidden mount which uses preexisting holes in
the bodywork under the bumper - no drilling holes in the bumper.  I give
these mounts my highest recommendation.  Very trick.  I have some photos
I could pass along if anyone is interested.

Tony

Anthony L. Mourkas
Hampden, Maine, USA
1984   Vanagon Westfalia    "Gertrude"
1986.5 Quantum Syncro Wagon "Wolfgang"
1991   Jetta Eco Diesel     "Liesel"

>I have the factory brackets that are used to mount the fog / driving lights
>above the bumper.  These do not require drilling any holes in your bumper -
>if you remove your front bumper you will notice two pairs of little drilled
>holes in the shape of a triangle.  The brackets that I have fasten on to
>these holes and then you put your bumper back on with just a little tab
>sticking up behind the bumper for you to mount your light on.  Cost is $25
>USD per pair.