Toe hook attachment doesn't exist.

So I went to plug in my toe hook to toe car to fast cars for the tranny replacement. No plug in place and looked like a hard rubber. So got out the drill and drilled through the rubber and hit a metal plate. The distance throu it was about three inches so it seems there is a plate blocking it. Not sure if I will tackle this this trip but just curious how to get at all this. I am sure the bumper has to come off but does anything else?

 

Kai the normal plug was not there it looks like someone put a flat piece of hard grey rubber in behind. Drilled through it and hit a metal plate. Did not want to drill through the metal. No threads are present.

 

Thanks guys what about bumper removal. Do I t ake off the wheel well liners or front liner in luggage compartment

 

Update.
As stated the spacer was reversed and it was blocking the toe hook threads. Needed a tap to run in and out then put anti sieze on the threads and ordered and installed plug from ricami, all fixed thanks guys.