From my experiance I'm going to guess that the front slide tracks will be the same as the Explorers. The 97-2000 body style Explorers.
I have a Gen 1 2002 ST that I replaced both front seats with those of a 2000 Mercury Mountaineer/rebadged Explorer. They bolted right up. The rails had the same hole locations and front bend for the front screws of the rail/seat.
I replaced the seats to "upgrade" my non-power seats to power seats with better support/plush compared to the standard high backs my ST came with from the factory.