Doors remained essentially the same from Series 2 to about the first year of production of the 110 (and remain the same for current military Defenders), with removable door tops and sliding windows. The 110 changed the sliding arrangement in 1983, but they are interchangeable.  Canadian Series 2a/3 I believe, had non-removable door tops. Antiburst locks became optional during S3 production, and are fitted to Australian S3s from about 1973. 
The first windup windows were introduced in 1984 and retain lift up handles but different locks with remote internal handles and locking plungers. These were replaced in 1987 by thicker doors with pressed frames and push button handles. These are retained to current production except as noted above, changed to steel skins in about 2003. All doors are interchangeable with appropriate checks and lock mountings/strikers, but the thicker doors from 1987 require the seats to be moved in slightly and a smaller steering wheel. All doors with windup windows have internal trim.
There is no guarantee that what a vehicle is fitted with today is what it left the factory with!
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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