I have never actually done it (never owned a fully floating S1!) but what I would be inclined to do is to make the spacer from a full circle drive flange, turn out the centre enough for the axle at least, and on the original outside turn out a socket to match the flange on the actual drive flange - this will ensure accurate alignment. I would probably use the spider type you have at the moment as the drive flange, but it does not really matter. 
Note that you also need to source longer BSF bolts for the flange plus spacer.
John
				
			 
			
		 
			
				
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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