There is an rpo code list on a sticker somewhere on the car, usually the trunk lid. Figure out which 3 digit code is remote entry and see if you have it. I don't know about '07 models, but around 2000~ it was AU0 for remote entry.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne