I have found these on Ebay, they seem cheep to me, as I understand it the inner bearing and oil seal will fit all series 1,2 and 3, its the outside bearing that changes. If anyone knows different please let me know.
Dibs
http://cgi.ebay.co.uk/Mazda-626-929-RX7-Front-Wheel-Bearing-z-3412_W0QQitemZ290540206631QQcategoryZ52640QQcmdZViewItemQQ_trksidZe17000.m7QQ_trkparmsZalgo%3DLVI%26itu%3DUCI%26otn%3D3%26ps%3D63%26clkid%3D7545466025549304859