Series 3 with retractable belts as standard had the belt running through a loop at the shoulder level (same anchorage as non-retractable belt, depends on body type), to a reel on the bulkhead behind the seat, mounted on a bolt 175mm in from the outside wall and 195mm below the top rail of the tub, on the top flange of the reinforcing rib. The hole has a 50mm square aluminium reinforcing patch spot welded on the outside (in the tub). The same could be fitted to any Series 2/2a either using a Series 3 tub or reinforcing (and presumably getting engineering approval) the existing one. 
The two lower attachments are the same as for the fixed belts, a bracket on the side of the seat box, in the lower back corner, attached by the bolts holding the seat box, and at least two versions of reinforcing for the anchorage points in the middle.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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