I've found some at my FLAP.  They were in one of the HELP packs with a assortment of sizes.

GregM

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of David McNeely
Sent: Tuesday, April 04, 2017 5:17 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Plastic part for the louvered rear vents

I'd say from a parts van, or improvise.

On Tue, Apr 4, 2017 at 2:28 PM, Edward V Barger <edvbarger@mac.com> wrote:

> HI
>
> Just came from the VW dealer went to get the small square blocks used 
> to secure the two rear louvered vents
>
> They press fit into the metal and accept the screws the retain the 
> louvered vents
>
> parts man says the are no longer available from VW
>
> any one know of another source
>
>
> Edward V Barger
> edvbarger@mac.com
> 310 922 6251
>