Unless BMW has changed the insert dimensions of “The little rubber plug with BMW” you’ll find that it easily falls out if BMW is right side up or upside down. I’ve tried several of them in my receiver and the only way they securely fit is when BMW is vertical. Additionally, make sure you check it each time the vehicle is washed since the brushes will pull the plug out and leave it on the drive. Go back to any BMW automatic carwash and you’ll see several lying around.