NHK Seating of America is at least one of the seat suppliers for Subaru in the US, and probably the main one. NHK Spring Japan is also Subaru's main seat supplier in Japan. Fuji Seat also makes seats for Subaru in Japan.
BRZ seats are made by Toyota Boshoku.
OEM Recaro seats in STI models are made by Recaro Japan.
Dan
Mach V
FastWRX.com