they included some weird poly bush, that looks like a big pineapple slice, which ends up being unusable, at least in a w201. I think, for certain rear ends, it may not apply? I haven't been under a 124 or 129 for a while, might be for them since it's a triple model kit. Also the chassis post on the w201 is not long enough to sit in the metal cup if that big pineapple slice is used, not sure wtf they were thinking, and they never answered my emails about it, though I never called, so there's that.
I installed mine without it, which is the same setup as the oem part and delrin stuff floating around.