Body Mount / Cage Nut replacement
The cage nuts just turned and turned, so I marked the cut lines

and cut out around the spot welds that held the old cage nuts inside the frame support

then removed that piece and remove the old cage nut from inside
new cage nut assembly

now welded the new cage in

and welded the piece I cut out of the frame support

A little more welding and grinding and it'll be as good as new.....