I found this on the H2O list, sounds like a Paulchen rack to me, maybe.

Dave

-----Original Message-----
From: Trevor Reid <skylight@home.com>
Newsgroups: rec.autos.makers.vw.watercooled
Date: Friday, June 19, 1998 12:31 AM
Subject: For sale: Aluminum Bike Rack for 1989 Westfalia poptop

>Yes I do have have a bike rack for sale, made of heavy tube
>construction- holds 4 bikes- goes on the back hatch and can be opened
>with it on. Excellent condition- like new...$175 obo