Pre cat sensor plug location

[Wigan Z4]

Can someone please tell me where the 2 pre cat lambda sensors plug into to the main loom on a BMW e85 2.0i please? I see the wires go under the engine but as one is only 360mm long and the other 460mm, I can't see where they plug in. Beer great if anyone can tell me, and so how to get to them. I'm starting to think it's re-enforcement plate off and they're hidden under there.

Cheers