broken rear shock towers
For Malc's benefit, my experience with the mounts occurred on a 72-73 csi. That car originally made its home in rust-frei Frankfurt.
I really can't remember that far back, but when first testing the rear shocks it was virtually impossible to get the rear end to deflect. In fact, I think someone dented the boot lid by testing the shocks! Hence the shocks were frozen or very stiff. After we started driving the car, everything loosened up to the point where I first thought we were piloting the Kon Tiki in the North Sea. Despite the well intentioned suggestion that a muffler hanger gave way, it was obvious when the left rear suspension sagged with a full trunk load of miscellaneous parts.
As far as your 02, there is far less weight back there and thus the forces are not likely as great. I have heard a lot about rusty strut towers on 02's but admit I have no idea if some were merely fatigued but unrusted towers. Jaymic may have an answer. but I am sure you know that.
I noticed you were looking for a lsd but not a 6 cyl side loader. Two things come to mind. First, I would focus my attention toward e-21 (320) models. In the states, the 320 sport models featured the same differential, although depending upon year, you might need spacers between the half shafts and the diff. There may have been a Continental version using a different badge. Second, there are a few folks that seem to always have lsd's available, at least in the states. You might look at the 320/e-21/02 boards in your neighborhood or more likely across the channel.
Good hunting.