I recently purchased these biscuit seats, but am moving a different direction with my interior. Condition is 8/10. While unpacking I broke one of the bladder air lines so price reflects that condition. I'm looking into a repair/replacement air line.
These seats also have harness cutouts and resemble the Exile style seats.
No brackets. You can purchase brackets from Garagistic, Garage Star, Planted, PCI, Tillet, Infinit-Fab (defunct), or a variety of other companies.
I looked for awhile to find this color as it's a perfect match for NA Miata Tan interior as you can see here:
I'll ship at buyer's expense. Price ranges from about $150 to $250 depending on how far from Portland, OR (97008) you live.