So im a little confused as to what design lll injectors will work in my mustang. I recently bought a set of injectors from a 96 ford explorer with part numbers f6ve-a5a except for one which was f4se-a1b. From my reading and research these injectors come from explorer v8 from 96-98, 94-95 crown victoria, 1999 6.8 v10, and i believe 98 contour. I cleaned and tested all of these injectors but two didnt work and my local junk yard doesnt have any of those vehicles i listed, but while looking online it seems as though the ford ranger and explorer 4.0 v6 has the same 19# orange/yellow injectors. So my question is why cant i use these?? Has anybody out there had any experience with these injectors?