I'm attempting to fit a towbar to my W212 2012 Estate. I've been unable to work out how to remove the rear light clusters and remove the bumper. Can anyone provide advice on removing the light clusters, I've already removed the two nuts from inside the boot, but the clusters won't budge. I've also removed all of the fasteners from the bumper but it won't budge along the sides in front of the lights. Any help would be appreciated, thanks.