I found these two 10mm nuts, caught on top of the RHS of MY12 4.4 TDV8’s engine subframe, near to the turbo. Does anyone recognise them or know where they might have come from? Discovered after removing the engine’s under-shield.

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10mm centre or hex?

These look similar to the nuts used on the cabin filter (which are a 13mm hex / M8 thread) or the nuts used on the air con compressor (which are also 13mm hex flanged / M8 thread) 2015 Range Rover Autobiography 4.4 SDV8

They're 10mm hex. Unsure on the thread size.

Engine cover nuts?

I think so. It seems they may have come off the engine’s side cover plates where a few nuts are in fact missing. Thanks for the suggestions.