Front Suspension on 126 Sedans

I am currently experiencing a lot of play in my steering wheel on my 420... I have seen a lot of questions regarding this item, however, what is the experience of those owners who have actually had it fixed, repaired?? Is it a steering box, ball joints, tie rod ends, control arms...? Or a combination? I have 163K on this car, it runs great and I intend to drive it for quite a while yet, so what should I have done at this point to the front end? Keep in mind since I have owned it I have done nothing so far. Thanks for the help..