Which side is the rear oxygen sensor ?

[ShaneHobson]

My 1992 JDM car showed a check engine light a while ago, so I took it to my mechanic to pull the codes.
He advised it was the rear oxygen sensor.

But now that I look at my parts car it seems that both oxygen sensors are side by side, so "rear oxygen sensor" doesn't make sense to me.

Attached is a photo of what I think are the oxygen sensors.
Does anyone know which one is rear vs front ?

Or is there another pair further towards the front that I haven't found ?

I think the sensors lower down in the photo are the oxygen sensors.
Have I got this right ?

I've started another thread asking what are the other two sensors in the photo (higher up the photo, closer to the back of the car).

Thanks, Shane