Here's an update to my seats: I pulled out the fixed back Sparco Pro 2000 seats and installed Bride adjustables and Takata Drift II harnesses. I had the Drift IIIs at first, but the IIs just work better/easier for me. I chose these harnesses because I wanted Takata's that are street legal in Europe and the US. I also took out the OEM bar in the back and installed Robispec's chassis/harness bar, which I wrapped the Takata's around.
Drift II on left / Drift III on right