94 Saturn Rear issue

My 94 Sat. Sw1 had something break in the rear drivers side tire area when I pulled in my drive way; there was a loud clank of metal breaking and clashing. I reversed a little and the same clanking noise happened. The wheel was "shaking violently" and made a loud clanking any time you hit a small bump. Upon removing the tire a piece that went from the back of the wheel hub (about 2 1/2 feet long) and conncected to the underside of the backseat area had broken close to the wheel. A friend welded it for a temp. Fix but now we can not find the proper replacement to make it safe for my children again. We've been told its a control arm, a stablilizer bar, a tie rod all by differen't mechnics. But none of these seem to fit when we look up parts online, most show up as front end parts. PLEASE HELP