Thanks, have that and a washer, what I have noticed is that the traditional fitting for the axe to the land rover has the fixing flanges folded under mine has them out side of the unit so it can be fixed from the outside, I have the original butterfly wing nut for the original fitting but not having counted the threads suspect the fitting is metric.
The picture you supplied shows a rounded nut to hold the axe.
Having looked again at my vehicle there is no position to hold the axe as the cab is glass fibre, more digging to do