Oxygen sensor Diagram

Does anyone by any chance have any exhaust diagrams that show the location of the upstream o2 sensor for the 197?

Have been through the online workshop manual but it doesn’t actually show the exact location, just tells you how to remove it. The post cat sensor I can see tucked into the side of the cat but all I can see for the pre cat is 2-3 wires going further up into the engine bay.

Am I missing something here??

cheers in advance, Josh