I, OTOH, have only had good experience with Meyle parts. I used their ball joint for one side of my W163 and was going to compare to the Lemfoerder on the other side, but I dumped the gas guzzler before either was a problem again.
Here is their brochure on your ball joint:
http://www.meyle.com/fileadmin/user_upload/service/downloads/meyle-hd-produktinformationen/mercedes/en_pl_zh/LL_16-2008_en.pdf