Jdm O2 Sensors

I am in the process of installing the TD06 turbo kit in my mr2 turbo. There are two oxygen sensors in the 92 JDM motor. A single wire precat sensor and a two wires aftercat sensor. The two wires sensor is seized and I can't remove it from the blitz downpipe. Does anybody know where can I get one or have one? Or can I use some other type of sensor to replace this one?

Thanks