Hey Wolfie,
Those are the conversion pieces I was referring to. There seems to be plenty of thread left on the exiting fitting, as it took a breaker bar and some leg power to break the bolt free. I think the fact that there was one of the thick washers missing that played a part in the disfiguring (The washers press against the rubber edge of the bushing on the outside and the rubber edge of the bushing on the inside rides against the cars tunnel) The bolt might have bottomed out before the trailing arm bushing was fully compressed. I could purchase those pieces, cut a generous area out around the threaded bung on the conversion bracket, screw it on to the bolt and have it welded on to the car in that position. Still thinking about the alternative of adding material to what is there and grinding the surface smooth, or welding a small flat washer to the face of the existing bung.