In a message dated 98-07-18 22:39:36 EDT, mayfly95@PAONLINE.COM writes:

<< Curious about the swivel front seats on a 90 westy, are they capable of
 being swapped out with
 the regular seats on say an 87 GL??
  >>

there are no such things as swival "seats".  all vanagon seats are the same,
with 2 sliding tracks underneath.
but on the poptop camper models, there was a swivaling track affixed to the
body, on which the seats slid into.
and yes, you can install this swivaling track in any Vanagon.

chris