Rear end work troubles.
Reply #1 –
open trunk
locate hat channel spot welds in the trunk floor pan
drill (big)hole in trunk floor over the quad shock mount that broke
weld new nut to a peice of 1.5"x2.5" flat steel(with a hole in it!) and drop in the hole
OR
drop new nut into the channel and follow that with a socket attached to a short extensionand rachet if youve got a helper to hold it while you tighten the quad shock mount bolt.