Man, I was REALLY hoping you weren't going to say they were the full seats. I was being hopeful, though I suspected they were the same as the BRZ Limited seats. For $3k you can get a pair of GT-86 TRD seats:
I can't imagine swapping to GT-86 Limited seats would be that much cheaper.
I've also contemplated have the Alcantara replaced with red Alcantara in my BRZ. Seems cheaper to just un-thread, cut the fabric to size and re-thread. Voila! Red-center Alcantara and dark leather seats! Sounds like an okay idea?
And I'll definitely share pics of my GT-86 parts. They JUST shipped today. I just got the notice from nigel-jdmparts.com. I think red handles (outter) and black handles (inner design) are next. You can order the black parts from your local Toyota dealer.