The plug was on the drivers side floor is one inch in diameter,all black rubber with a curved rubber handle molded on the top (of rubber)and looks like a knife cut on one side.It looks like it was pried out of something. Where does this plug - or gasket come from. It is one inch high and wide and also there are 2raised lines that meetin a cirle which seems to be the part of the plug which is inserted into who knows where. I am worried someone is trying to sabotage my vehicle. Please give me any info about this plug asap. Thank you.I appreciate it.