Didn't you just do that job? The reason that I ask is that I followed your thread when I rebuilt my 300SD front end last year and now I am getting some clunks.
I think it is because I did not use original parts. When it was all together, I took it to the dealer for an alignment and could not get enough Caster to meet the alignment specs. (The car has never been hit and prior to rebuilding the front end I had no trouble meeting specs). Why do you think your car has clunking noises after such a short time?
In my case I think it is because the (Febi) track rod mounts that I used are of such poor quality that they are causing the problem.

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Tom Hughes
St. Louis
84 300SD
92 300D
86 300SDL