hey help me out down here in new zealand,got a 1999 ek3 civic vi-rs vtec-e

converted it to jdm b18c-r using boomslang harness 0bd2b-obd2a

all i need now is what are my wires called for oxy sensor?

i have
1-primary o2 heater control (pluged in)
2-primary o2 sensor-1 (pluged in)
3-?
4-?

this is a single 4 wire oxy sensor...

any help would be appretiated

thanks
sam.