Hi all, I have a 2011 Golf Mk6 TDI that recently developed a knock from the rear exhaust. I've traced it to the rear silencer exhaust mounting bracket and purchased a new one. However, there is a hole in the 'car body' that suggests something is missing - see the photos. Any idea what is missing?IMG_20201207_102637_LI.jpgIMG_20201207_102702_LI.jpg