Several points:-
1. seat belts were not legally required, nor, indeed did Australian standards for them exist at any time during 2a production. 
2. However, many 2as were fitted with seat belts when new, or fairly new, particularly by SMHEA (World pioneers in seat belts). In the absence of standards these belts and anchorages should be OK provided the vehicle has been continuously registered.
3. To fit belts to a vehicle not previously fitted, requires fitting to current standards. For a 2A this means late Series 3 fittings (which are bolt-on, pretty much, but some fittings are not available new), or engineering approval. The lower mounts are available and easily fitted - the problem is the shoulder mount. Your preference to have it topless means that you need the mount on the rear bulkhead. If it is not already fitted (it was on some late 2As) it will need engineering approval, and the engineer will probably require some sort of structure to raise it to shoulder level. The usual way of achieving this on an open Landrover is a roll bar - which will need engineering approval.
I am pretty certain that all new seat belts to day are required to be self-adjusting with inertial reels, so you can't fit ones exactly the same as you picture (and ADRs also do not allow two piece belts as they allow only part of the harness to be fitted).
How closely the ADRs are required to be followed is likely to depend on the engineer!
Hope this helps,
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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