The rear bar can be purchased directly from VW..

 The part no.s are:

 1x 251 411 025 C for the bar itself,
 2x 253 511 049 for the linking bars between the sway-bar and the trailer
 arms
 2x 253 511 417  and 2x 253 511 413 to mount the sway bar to the vanagon

 These parts were used for the german ambulance Vanagons. You only have to
 weld a mounting onto the rear trailer arms, were the 253 511 049 fits into.

 Originally, the ambulance versions used different rear trailer arms, but
 some people here  in Germany use this stabilizer bar on the
 "normal-trailer-arm"- Vanagons.

 I would have attached a small GIF, but since all attachments are stripped
on
 this list, I will post this pic on www.vwbus-online.de/feussner/stabi.gif
 Just a moment, please...

 Raimund

 ----- Original Message -----
 From: "Christopher T. Berchin" <ctb1@PEOPLEPC.COM>
 To: <vanagon@GERRY.VANAGON.COM>
 Sent: Friday, August 10, 2001 11:02 PM
 Subject: Does a Rear Anti-Sway Bar Exist?

> > Hi everyone.  Just curious - has anyone ever seen a rear anti-sway bar
> (aka
> > stabilizer bar) offered for the Vanagon?  There's no evidence of one in
> > Bentley (I thought maybe later models or other models might have one),
but
> I
> > wonder with all the folks that actually run these things on tracks in
> Europe
> > if there just might be a rear anti-sway bar out there.  I'm a nut, I
know,
> > but if I could find a rear bar, I'd like to investigate it.  Thanks.
> >
> > Chris
> >
>