In a message dated 99-02-20 16:33:04 EST, you write:

<< If anyone else has installed these, how did you seal the
 back to protect it from the weather, moisature,
 condensation, etc.
 Thanks for any info.
 steve >>

Steve,

On the Carello H-4's that I installed there was a BIG rubber boot that covered
the entire bulb-socket.
There were three slits in the back of the boot that lined-up with the three
prongs on the back of an H-4 bulb.
This provides a very effective weather seal.
I know that Bosch also uses this sort of arraingement on their round H-4's.

Hope this helps,

Sam Bateman
Fork Union, VA
'87 Vanagon GL