The obvious problem which will allow the tyre to touch the radius arm is adjustment of the steering stop (could be damaged).
But since the stop affecting clearance on the RH tyre is on the LH swivel housing, a bent tie rod will have a similar effect.
Less likely but still possible, is the panhard rod or its bushes or anchorages being damaged or loose (although this is likely to cause other symptoms). Even less likely, but still possible is a bent axle housing.
I assume you have made sure that you do not have a loose wheel bearing or loose or bent wheel. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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