How remove wiring plugs from firewall

[Bret B]

Just pulled mine out last week. The plugs are held in with semi-hard rubber grommets. I pushed the edges in from outside to inside and worked around the entire edge before it pushed through. It seemed as though the plug was going to break or get damaged, but it just took a little effort and working around the entire edge. Used a flat head screw driver to do the deed. Hope that helps somewhat