The shoulder fitting (on a truck cab) is on a steel frame that is bolted to the top and bottom of the cab rear panel, P/N 395240,395241. The inner bottom fitting is bolted through the 'floor' panel behind the seats, with, on a trayback, which I gather you have, a steel strap to the tub support bracket welded to the chassis, and the reel is attached to a point on the lower  back panel of the cab. Where fitted by the factory to late Series 3, the hole for this is reinforced by a spot welded patch. 
All the fittings except the factory bits (you already have the bottom outside one) will have to have engineering approval, so you probably should talk to the engineer before doing anything.
There are other arrangements used, and it should be noted that most 2a Landrovers were built before there were any design rules for seat belts! This means that many will have been fitted historically with installations that do not meet subsequent design rules.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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