i'm in the middle of replacing mine. the new units ( the threaded on part, not the C ) that goes though the spring eye, and mount on the frame. seems to be a tad larger diameter , i didn't want to force it. so i greased it up , and it went in most of the way . but on the frame side, i had to reuse the org part. the new one was just not going to do it. any known issues with new remade shackles like this ? glad i kept my old parts

thanks brian