My rear subframe is geting kind of scaley looking so while I have the rear suspension off I am gong to drop that too and do some work on it. If I am going to take it off, I don't really want to put the same old worn squashed out bushings back on with it. Are rubber bushings from Ford the only option for these? Are poly ones availiable? Has anyone ever tried anything else here, such as Aluminum? That might just be an all around horrible idea.