from European Car, August 1995 issue, page 28:

"Projektzwo offers a conversion for the VW Eurovan that allows you to use
the rear windows for ventilation. Extensive body work isn't needed. Simply
exchange the stock units <windows> for the Projektzwo motorized units,
install the motor and wire the cable. Cost is 495DM <about $330US>.

Contact:

Projektzwo           telefon 0-88-06/14-71
Industriestr. 9      telefax 0-88-06/27-38
D-86919 Utting
GERMANY

<pictures shows the rearmost side window opened at the rear, like the
*horrors!* D*dg* C*r*v*n>