Re: Part No 979662 (therf)
There are several places where this sealing plug is used.
On the front part of the car there are 2 used. They would be on the floor pan in the area that slopes up towards the firewall. Under the clutch or brake pedal and under the left foot for the passenger side.
As for the rear there are 3 of them, in the area under the rear seat floor pan.
All should be visable from under the car. You figure out how to get under.