Easiest way is to compare part numbers from both vehicles. IIRC, the 2007-10 Gen 2 ST was based on the 2006-10 Gen 4 Explorer.
EDIT- See Curt Mfg. link below two posts down. 2007-10 ST's and Explorers both appear use the same #31545 hitch.
Contact Curt direct if you have any questions. GL
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