I upgraded to Bilsteins on my 87 from stock Boge, measured the height (from
ground to center of wheel fender lip) before and after with no significant
change in ride height.  I believe there was 5mm increase in the rear but
none in the front.  However I would still replace all at once. Procedure:
http://www.251.org/shocks.html Photos: http://v-dub.musa.com/images/shocks/

Dave
251.org
87 Vanagon
61 Microbus

>It's not a good idea to upgrade just one end of the van with Bilsteins.
>Bilsteins are high pressure gas shocks, stockers are regular hydraulics.
>Doing 2 at a time will raise that end of the van .25 to .50 inch and will
>change the handling characteristics alot.  Do all 4 at once.