wow. i'm not feeling that bracket one bit.
if that setup gets loose in an accident. you'll be in a worse position than ever.
i put s2k seats in my civic, i swapped over EVERYTHING
literally took the seats apart and used all civic hardware. luckily it all swapped over.
no modifications. bolted right up.
if i were you. i'd take apart the passenger side civic seat and the rsx seat, and try to swap over all the civic hardware to the rsx seat.
that bracket just doesn't look safe.