Yes, driver's side seat rails from a "normal" sierra will bolt in on both the driver's and passenger's side of the ute.
However, are you 3 ft tall?

almost nobody needs to move the stock seats
forward and you can't move them back as they will hit the cab back.
You need to be careful what seats you try to use as you'll eat up legroom very quickly if the seats are thicker in the backrest than the stock ute seats.
I have run Sparco Sprint seats in my ute (fixed) and now run LS Recaro's, but they eat heavily into leg and head room.

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The Recaro's are on Recaro slides, but they are mounted as low as possible.
Steve.