There are 2 O-Rings:

Small one on the smaller cap on the cover (if there is one - there's
sometimes a plug (431 422 360 A)
N901 763 01  Dealer Price $2.30

Large one inside the cover
431 422 383 A  Dealer Price $6.00

Still available, but special order, my local dealer 2 blocks away
doesn't stock.  If it was me, I'd replace both and be done with it.

--
Jim Thompson
84 GL 1.9 "Gloria"
84 Westfalia 2.1 "Ole Putt"
72 411 Station Wagon "Pug"
75 914 1.8 "Nancy"
Full Timing From March 1999 To January 2012
oldvolkshome@gmail.com
http://www.oldvolkshome.com
Find me on Facebook:
http://www.facebook.com/people/Jim-Thompson/100000710343835
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On Tue, Dec 4, 2012 at 1:00 PM, Steven Shelton <shelton4@gmail.com> wrote:
> I was trying to find the source of a power steering fluid leak around the
> reservoir on my 1985 1.9L Camper when I noticed the that large o-ring in
> the cover is missing.  Unfortunately, since I replaced some of the lines to
> the reservoir in January, I'm undoubtedly the one that somehow lost that
> o-ring.  I can't find one listed with any of the vendors.  Has anyone found
> a replacement anywhere?