Just did this last weekend.  What I found was in the largest in a grommet assortment (about a dozen various-size for a couple of bucks) at Advance Auto.  I also looked at various PCV valve grommets at the same store but the entire assortment was cheaper than one PCV.  The firewall hole is about 7/8" so the grommet has to fit that snugly and have a hole large enough to pass the fuel line.

Stephen

--- On Fri, 8/15/08, Arlene K Sondergaard <asonder@USGS.GOV> wrote:

> From: Arlene K Sondergaard <asonder@USGS.GOV>
> Subject: firewall plastic fitting/grommet
> To: vanagon@GERRY.VANAGON.COM
> Date: Friday, August 15, 2008, 11:56 AM
> my mechanic says he can get the kit to replace the
> fuel lines BUT since the plastic fitting thru the firewall
> is no longer
> available
> and the grommet that was substituted isn't available
> either--he cannot do
> it.
> where can i get a part to replace this bit?
>
> thanks
>
> arlene sondergaard
> 87 wolfsburg vanagon
> washougal washington