92 lx convertible rear suspension question

[buckneked7719]

i have a 92 lx convertible 5.0 my problem is there is a large cast object that bolts directly under the rear end useing 2 bolts it looks like some sort of counter weight im not sure what to call it or what it does. but mine fell off and is now gone .i have noticed the car rides rough in the rear now.any help on what this is and where to get another. i have been to several junk yards hard tops dont have it and 4/6 cylinder convertibles dont either i havent found another v8 convertible .ford is no help either thnks