I think they have quit actually making parts for a lot of the old cars many years ago and they are still just sitting around. A lot of the time there are only a couple dozen or less left of some of the things I order for mine. The captive nuts that hold the guide rod brackets to the body on the w126 are soon to be NLA, and there is no usable substitute. Of course a suspension rebuild for a w126 costs more than one is worth now even if you do it yourself.