Well, the cost of those replacement sensors from Subaru are just stupid, $565.00. In any case, just bought one as I had no time to chase the alternative via Bosch Auto Shop. They don't have any in stock as listed for the Subaru 3.0R on their web site, but they do in the USA website. US Part number is 15013 for the Front A/F (or O2) Sensor.
In any case, learned where bank 1 on my engine is (again)

as we put the new sensor in the passenger side, and still had the fault. Swapped sides and all good!
So, Bank 1 on the Subaru Liberty 3.0R H6 is on the driver's side or right hand side looking from the driver's seat. I hope I don't learn this lesson again...
Also got a new image from Matt yesterday, and loaded it up this morning, went for brekkie up at Emerald (Manta Cafe - Good small cruise worthy place!). The new image has reduced some of the torque hole, but still a little more to go. At least it is heading in the right direction.
If we cannot get rid of the torque hole in the 2000-3500 rev range, then will consider downsizing the centre muffler to put a little more restriction in. Just a consideration at this stage and we will see how the dyno tune with Matt goes, tentatively 06 Dec.
MY15 Jaguar XFR-S 5.0 V8 SC 8AT White Saloon (Stock - nothing more to do with 400+ KW

)
MY11 Jaguar XFS 3.0DTT 6AT White Saloon (Prepped for sale)
MY19 Subaru XV 2.0iS the shopping trolley and weekend all terrain cruiser!