Yeah, that sounds about right. I just did a rough measurment my old axles and came up with about 56.5 after you narrow it. I had to get custom axles for my project since mine had to be narrower than that.

Summit lists some Ranger replacement axles that are 27.25. The center pin is .875 and the rotors are .25 on each side. That gives 55 7/8" overall, but you would have to narrow both sides. Also, I don't know if the Explorer rotors will fit on those axles. They are listed for a 1997 Ranger.

Mike