According to ASA, the part numbers for the CT9A Evo front O2 sensor are:
2001 VII - MR578531, succeeded by MN153398
2002 VII - MN153398
2003-05 VIII - MN153010
2006 IX - 1588A064
My car is a 01' VII and I couldn´t find a OEM or aftermarket replacement anywhere. The closest I got was the Denso...