I had a crack develop i my 1977 450sl. There was a official recall on these and may stil be in effect. My local garage found this and then I made a complaint through the mercedes headquarters in monvale, new jersey. I Had the subframe replaced at the garage, and they returned the part to mercedes. The repair kit is long out of stock, replacement is the only safe way. The crack was at the upper control arm bushing creating a dangerous situation., It will take lots of pressure to get some thing out of mercedes. Consider that my car was serviced by the local dealer, and although the recall was in effect, they never checked or notified me!After the complaint, I receivd the recall notice in the mail! Partial settlement was reluctantly made. bring car to the dealer then complain, may be better result. Have paperwork if you need it. good luck Abe G