Exige seat for sale, works on either side and comes with passenger side rail. Seat has been slotted for sub belt mount and is in good overall shape. $900 plus shipping.
I have Elise seats in my Miata DD and I used these brackets: https://www.flipsidecustoms.com/product-page/lotus-elise-seat-bracket-kitTrying to source some brackets that will adapt this to my miata. I am very interested so long as I can find the right brackets. I didnt know that the seats were symmetric between the driver and pass side.