Question: Replacement nut for 2002 Axis

Hi. Has anyone had to replace the locking nut on one of the old Axis models? Mine has grown dull, and come re-fretting time, it will have to be replaced. My question is, whether it is necessary to get hold of a music Man branded nut, or if as original FR nut such as this one will do? The radius and width are the right size, as far as I can tell.
Thanks in advance.

Floyd Rose Nut R-2, Chrome at Gear4music