Hi all, I've been searching and searching and can't find an answer to this. On the firewall, where wires go through, there is a circular, rubber ______________, (fill in the blank). It looks like what they call in Europe a 'blanking grommet." It fits in the hole, is rubber or rubber like, the edges straddle the sheet metal and the middle is fairly thin, so you can poke a hole and run wires through it. Anyone?????