The US vans only have one bulb for each side, so it sounds like your van is
fine.  The extra empty socket is for fog lamps.

----- Original Message -----

> My tail lights are out on my 90 westfalia.  Sounds simple enough, I
replaced
> the bulbs, which fixed half of the problem, on eon each side now works.
> Still, that leaves one on  each side not working.  Looking a little
deeper,
> literally into the socket, I see the metal piece that should be in the
> bottom of the socket is missing from the two in question.