Found 13mm nut underneath LR4

[Dahyno]

I found this nut on the floor underneath where I park my '15 LR4, near the front left drive side. I know it's a stretch to ask, but does it look familiar to anyone? I measured it at 13mm, it looks like it may have popped off one of the control arms from reviewing the parts diagrams, but I couldn't spot anything out of the norm visually.

Any thoughts / ideas?

 

[Rover Range]

Skid plate nut?

 

[powershift]

+1 on skid plate. There is at least one nut/bolt pair on drivers and passenger side.

 

[scapistron]

Sway bar end link nut?

Looks too greasy to be from the exhaust.