Oh, if and when you decide to work on the subframe mounts, support the trailing arm somewhere under the spring or shock mount or forward of that location before you remove the big bolt. It's not mandatory since most likely that end of the subframe mount will drop a half inch without you prying on it, but it might drop and hurt you, and that's not worth the risk. You can remove the support when the big bolt is out to then manhandle the subframe mount so you can press out the old mount and the bump stop above the end of the subframe.

Sixto
91 300SE
87 300SDL
83 300SD