We have some Bride ZETA III Japan XLs in stock with Bride XL Rails specific for 370Z! These seats have carbon fiber backs with suede for the material.
Bride ZETA III Japan XL:
https://www.kamispeed.com/products/b...e-xl-japan-frp
370Z Type XL Driver Side Rail:
https://www.kamispeed.com/products/b...-09-lhd-driver
370Z Type XL Passenger Side Rail:
https://www.kamispeed.com/products/b...-lhd-passenger
Those rails are specific for the Bride ZETA III XL size seats! Let me know if you have any questions.