Mx5 Bolt on shaft nut size

[TheLuke]

My bolt on driveshaft nuts seem to have liberated themselves free of the ears and as a result I only have 1 holding my driveshaft on.

I am having trouble finding the size of the nut i need, I have bought some M10's which I believe is the correct size but the thread isnt right.

Does anyone happen to know the Nut size thread. I believe I might need an M10 fine, but there are three different sizes.

All help appriciated.