I've rented a BMW 318d Touring wagon. I'm not sure of the year but it seems to be at most a few years old. I'd like to completely remove the bottom of the rear bench seat (the part you sit on). This will enable the rear seats to fold completely flat. I'm stuck at figuring out how to disconnect the middle seat belt shoulder strap — it runs through the seat bottom, preventing it from being removed from the car.
There is a largish bolt/screw at the bottom end of the strap. I'm not sure what type of bit it takes but it looks like it might take a Torx bit.
What is the best way to remove this shoulder strap so I can take the seat bottom out?