Most that sag, all ready have worn out lower hinges that will need welding or replaced. All most every one I've seen sagging badly are so far egged out, that an over size bushing won't help. Best to weld it up some then clean it up with a reamer. I also use 80's ford van style pins and bushings since there thread on the ends vs pins holding them in place. Allows you to tighten the hinge a bit more, factory ones are more like a rivet fit and clamp the hinges a bit and all the replacement ones offered for the fox body kind of suck.