Import seats in my Ford...not likely.
I have a set of over the counter Ford Motorsports seats in mine. These are also known as SVO seats, but have a halo head rest.
Original tracks bolt right on, so they bolt right in.
Be aware that putting any modern seat in a Mustang will most likely raise you up and force you forward. Why?
The foam is so much stiffer that you don't sink in like in the old seats. I lost over 1.5 inches due to stiff foam and springs.
I'm tall (6'5") so I did the seat platform lower, too
Pics at http://homepage.mac.com/bossbill
(Click on Seat Lowering section)