failed to get a new grommet... I'd suggest doing this..
Get a bicycle inner tube with right size (rather small), cut a piece about
3 or 4", slide it over the harness and position where the hole/grommet is,
tie it with zip ties on both end and pull the harness thru the hole... if
needed add another layer.

On Fri, Apr 10, 2020 at 8:57 AM Bruno Walser <bruno.walser@multavista.com>
wrote:

> I recently replaced my 2.1 WBX with a 2001 ALH TDi engine. With the removal
> of the old wire  harness I also pulled out the grommet on the firewall
> where the wire harness goes from the ECU to the engine. I installed the new
> wire harness and added various additional wires such as the wires to the
> solar panels. The new ECU is located where the old one was, underneath the
> rear bench. I was not able to reuse the old grommet. Thus the new wires go
> now through the fire wall without a grommet and the hole is still partially
> open. I am still looking for a good way to close up the opening to prevent
> air-, water, mice etc from getting in?  Good suggestions are very
> much appreciated? As you all know, the hole is not easily accessible.
>
> Thanks
>
> Bruno
>