I don't think plumber putty will work because it will dry out and get hard.
Another option is taking the part to the plumbing section of a hardware
store and look for o-ring or flat o-ring that fit.... I am sure that you
will find an o-ring that fit...
similar to these

https://www.homedepot.com/s/flat%2520o%2520ring?NCNI-5

https://www.amazon.com/Beveled-Faucet-Washers-Screws-Assortment/dp/B074PZDTQL/ref=sr_1_40?_encoding=UTF8&c=ts&dchild=1&keywords=Faucet+O-Rings&qid=1594225224&sr=8-40&ts_id=3226856011

https://www.amazon.com/Rubber-Washers-Connector-Replacement-Faucets/dp/B07LH4BD5Y/ref=sr_1_51?_encoding=UTF8&c=ts&dchild=1&keywords=Faucet+O-Rings&qid=1594225247&sr=8-51&ts_id=3226856011

On Wed, Jul 8, 2020 at 9:07 AM David Boan <dboan@outlook.com> wrote:

> VW came back and said the part is discontinued and not available.  Guess I
> am back to the rubber gasket idea.  I wonder if plumbers putty would work
> better?
> ------------------------------
> *From:* Dan N <dn92610@gmail.com>
> *Sent:* Wednesday, July 8, 2020 11:06 AM
> *To:* David Boan <dboan@outlook.com>
> *Cc:* Vanagon Mailing List <vanagon@gerry.vanagon.com>
> *Subject:* Re: washers
>
> or may be these?
> Part #: 111837637 on this link
>
> https://www.mtmfg.com/vw/2290/Volkswagen-Bus-Vanagon-Eurovan-Vent-Wing-Parts
>
> https://www.wagen-werks.com/vent-wing-pivot-rivet-kit-bug-pair/
>
> On Wed, Jul 8, 2020 at 7:50 AM David Boan <dboan@outlook.com> wrote:
>
> Great suggestion, thanks.  I just sent a message to the local VW dealer to
> see if they can get them.  If they cannot then I think your idea is a good
> approach while I wait to see if Van Cafe gets them in stock.  I tried using
> silicone but that was useless.
> ------------------------------
> *From:* Dan N <dn92610@gmail.com>
> *Sent:* Wednesday, July 8, 2020 10:48 AM
> *To:* David Boan <dboan@outlook.com>
> *Cc:* Vanagon Mailing List <vanagon@gerry.vanagon.com>
> *Subject:* Re: washers
>
> those washers are fiber and break easily when you take them out. I made
> one with a piece of rubber from the bicycle inner tube.
> if you don't want to wait, cut a square piece of rubber, make a hole to
> fit, put it on and round it off with the tip of an X-acto knife.
>
> On Wed, Jul 8, 2020 at 5:38 AM David Boan <dboan@outlook.com> wrote:
>
> I just replaced the trim around the driver and passenger windows,
> including the vent windows.  When I took the vent window glass out on one
> side two of the pressure washers crumbled.  The only supplier I have found
> is Van Cafe, and they are out of stock.  Does anyone know of another source
> or an alternative to using the pressure washers?
>
> Thanks
> Dave B
> Boise
>
>