Wheels are interchangeable (except some alloys) across all Series Landrovers (except some FCs) and 90/110/Defender, and some classic RR & Disco wheels will fit (stud pattern is the same, but some alloys and steel wheels will not accommodate the hub on Series Landrovers).
However, wheels did change across Series Landrovers. 
Very early Series 1 had narrower (4.5") rims, and most swb rims should be 5", lwb 5.5". Offset changed, with more offset for later Series 3 and even more for 90/110/Defender. Later Series 3 used locally made wheels with a continuous rib joining the stud holes. These do not allow the earlier (double sided) type wheel nut to go on as far as the original wheel, but seem to work OK - the stud does not go right through those nuts anyway.
So in summary, you can use wheels off Series 1/2/2a/3, but preferably all the same. In particular, make sure they are all the same width and offset (check the number on the wheel). Many if not most swb have had the wider rimmed lwb wheels fitted, and these are preferred if fitting larger than 7.00x16 tyres.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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