A good link is http://www.susquehanna.com/susq/hella/fog.htm.  Someone
posted a note about these a few weeks ago, can't remember who but thanks! 
I bought a pair of the Hella XL auxiliary low beams on sale for $95 and
these are GREAT!  I feel all my problems with the poor vanagon lo beams are
solved forever, and at a bargain price.  Illumination to the right and left
are vastly improved.  As a bonus, the provided switch fits in the blank in
the lower RH dash and looks like a factory fit.  I took a long trip this
past week to Camper on Cape Cod (thanks Wendy and John for a great time)
and loved the lights on the long drive. 

Bill
St. Louis, MO
www.geocities.com/yosemite/gorge/1706