A bit more work, but probably not any more expense - just swap all the bits from the later axle, keeping only the axle housing and half axles - I'm pretty certain everything else will fit. 
A few things to watch in either case - Most threads on the S1 will be BSF, but S3 will be UNF with maybe some metric if it is late. A particular thing to watch is tie rod ends. Tie rod ends from Series 1 up to early Series 3 used a shank into the tube with about a centimetre unthreaded. Later S3 are fully threaded. These two types must be matched between the tie rod end and the thread - failure to do so has resulted in fatal accidents. The thread on the taper bit that goes through the hole in the arm does not matter, and the tapers are all the same.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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