As noted, the Series 2a changed in the last few months of production to 27mm AF nuts (single sided) on the same 9/16" BSF studs. 
However, I would comment that in over fifty years of driving Series Landrovers with the original nuts, I have never known of them to burrow into the wheels unless run with loose wheel nuts. It is simply a problem I have never heard of, and I suggest that the larger nuts will not solve the problem, whatever it is. If it is a wheel that has been run loose in the past, the only real fix is to replace the wheel.
It is also quite possible to replace the studs with drive in Series 3 studs by drilling out the holes, but this represents a fair bit of work by the time you do all four hubs, and becomes a bit pricey by the time you buy all the studs, nuts, and almost certainly new hub seals, gaskets, bearing lock washers, etc.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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