I am trying to replace the lower control arm bumper on my 71 Duster with a 73 disc brake conversion. It seems simple enough to remove the nut, but there is not a whole lot of space to get either a socket and even less to get a wrench in there. Who knew this would be so hard...

 

Use a thin wall socket and extension and go up from the bottom. Unless your LCA is damaged, you should have room to get at the nut.