If you want to get your alignment close to what your Mustang had before disassembly, match the old and new tie-rod assemblies as close as you can get them. Remember to confirm how deeply each tie-rod end is screwed into the coupling. Each coupling is threaded with left- and righthand threads to screw tie-rod ends in or out. It is virtually impossible to get this backward. When you get ball/stud distances identical to the old tie-rod ends, you can't miss. Once the new linkage is installed, get a professional front-end alignment right away.