i have a used metal Nardi steering wheel hub. comes with original box. fits 2nd gen RX7 and Miata may fit other mazdas as well, works with most 6 bolt aftermarket steering wheels (Nardi, Personal, Momo, etc) $45
i also have a mint un-rusted sunroof panel off an S4 GTR RX7 in Japan. i know how hard it is to find clean sunroof panels. $50