It wouldn't be a direct bolt up, you would have to do some fabrication work plus some wire harness sorting and adapting to make the power seats work.
Plus, I've never been impressed with any of the stock mustang seats, short of a few of the different Cobra ones.
It would be far simpler to order a set of Sparco or Recaro seats and thier contour specific mounting brackets. Not all of thier seats are outrageously expensive, but they are all crash tested unlike the ebay and pep boys crap seats. www.racerbargains.com for Sparco and www.on-trackperformance.com for Recaro