Hi, i'm just in the process of replacing my rear shocks on my 6, however, i have a problem with the rear nearside one, in particular the upper bush. It seems to be compressing (almost flat) once i tighten the top nut and release the spring clamps, which, looking at the other side, is not right. Ive checked the exploded parts diagram for this strut i seem to be missing a small part that sits between the top mount and upper bush. I'm going to order this part but in the meantime can anybody tell me if this is causing my issue or am i doing something wrong...???