You are going to have to be more specific. Which year Sport Trac are you referring to?
The 2001-2005 Sport Trac shares the front suspension/drivetrain with the 01-current Ranger, as well as 95-01 Explorer.
It isn't wider or different in any way, except possibly a larger sway bar and different spring rates on the torsion bars.
The newer sport trac is completely different than the Ranger, it's based on the 02+ Explorer and is not compatible.