Your state government should have on line details of ADRs and when they came into effect. (Be prepared to wade through a lot of reading)
But just as a start, ADRs post date the end of Series 1 production by around ten years, so the only applicable ones would be the very few that are retrospective. Specifically, there is no requirement for seat belts on a vehicle of that age (which does not mean that they are not a good idea), but as a general rule, if fitted, they will need to comply with ADRs, but this will be a state rule, not an ADR.
Your best bet is probably to ask your registration authority what is required, although it may be necessary to go to a bit of trouble to find someone who knows what they are talking about when dealing with a pre-ADR vehicle. As a general rule, if the vehicle meets the requirements of when it was first registered (or in some cases manufactured) it will be OK, but there are some exceptions - for example, in NSW, two windscreen wipers are required, and all states require rear reflectors (all Landrovers have these anyway).
There are a few items that are really worth fitting, even if not strictly  required, apart from seat belts. Probably at the top of the list is turn indicators, and, if used as a daily driver, a reversing light. 
Hope this helps,
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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