I think you are thinking of the threaded inserts that are for the muffler
heat shield.
I think he is talking about holes in the body below that, on the very rear
lower edge.

I just looked at two 85's, and 86, and two 87's.
looks like they are on 86 and later vans.

----- Original Message -----
From: "Zolly" <zolo@FOXINTERNET.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, September 02, 2010 8:56 PM
Subject: Re: rear valence trim?

> As you can see, it is obvious that the holes are for bolts or screws to
> hold
> up the heat shield/splash guard.  In this case, they are 6mm bolts.  But
> most of the time, those little nuts that were fixed in the body, are
> spinning around and the bolts won't help.  I have seen extra holes drilled
> for screws to do the same.
> Zoltan
>
> ----- Original Message -----
> From: "Gregory Smith" <gfs@GREGORYFSMITH.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Thursday, September 02, 2010 7:02 PM
> Subject: rear valence trim?
>
>
> While under the van recently replacing my O2 sensor, I noticed four
> factory holes in the bottom edge of the rear valence.  Is there a
> super-rare, super expensive trim or other piece that fits the holes?
> Just kinda wondering...
>
> Gregory Smith
> '88 Vanagon GL
>
> Smith Design Studio
> Small Building Company
> Olympia, WA
> 360-239-0429
> gregoryfsmith.com
>
>
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