As Dave says, they are a straight swap. Worth noting however that a significant difference is that the hinge axis on the 2a is vertical, where with the Series 3/90/110/Defender hinges it is inclined inward so that on level ground the doors will automatically shut. 
Outside mirrors standard on Series 1/2 were a convex mirror on the front of the mudguard. These were not very effective and were very vulnerable, and were often replaced with various alternatives. (Actually most Series 1 would not have had an outside mirror as they were not required, and very few Series 1-2 would have had both sides, although these were listed as standard for the 2a)
By late Series 2a army Landrovers had mirror arms mounted on the windscreen hinges, and these tend to be satisfactory. Another type that was, I think, an aftermarket one, used a special arm that replaced the pin on the top hinge, and these can also be satisfactory. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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