As Richard eventually found out I had some here in stock and he has my last two on their way to him.  Shortly afterward I called my VW dealer~supplier and ordered both that O-ring and the 003 325 381 O-ring which has been obsolete for a long, long time.  Both are now available again in Germany, VW Classic Parts is actually doing what they said they would do, make available obsolete parts.  Now I've got a new supply on their way to me.  So, BIG shout out to VW Classic Parts.  Yes, I know the prices are not the best but way better than not having these parts at all.

On 2013-04-12, at 4:07 PM, Automatic digest processor <LISTSERV@GERRY.VANAGON.COM> wrote:

> Friday greetings to the List,
> 
>                I'm having trouble locating an O-ring for the diff on a '91
> auto box part # 010 409 259A, dealer says its NLA. Its dimensions are 3 x 78
> and I presume that's in mm. Have checked with various venders with no luck
> yet. I did find one at McMaster Carr but not sure if the dimensions for the
> O-ring diameter are inside or outside. Does anyone have a clue,I don't have
> an etka? I'm hoping its an inside diameter since that's what McMaster sells.
> Also how critical is it to replace this particular O-ring. I'm going to be
> changing out the 2 pinion seals that reside in a diff housing separating the
> two trans fluids and there's 2 O-rings in this assembly that look like they
> should also be replaced. Its one on those that's gone to vanagon heaven.

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel Trains (Collection for sale)
Frank Condelli & Associates - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
Vanagon Stainless Steel Exhaust Systems
BusFusion a VW Camper camping event, Almonte, ON, June 06 ~ 09, 2013