As far as I am aware the only difference in the bullbar is whether or not it has the forward extension on the grille for airconditioning. This varied over the years. As yours does not have airconditioning, it presumably does not have the extension. In this case either bar should fit, albeit the one designed for the extended nose would leave a gap. 
A further possible parts problem is that the 90 was not sold in Australia at the date of that vehicle, and there may be a few parts hard to find here. But most parts are either the same as or interchangeable with later Defenders, up to the  TDCI anyway. But 90s have always been rare in Australia, so specific 90 parts will always be a bit harder to find.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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