I think you will find that the rims will have a lower load rating than what is required for a D3 but is a bit hard to confirm.
RRS 18" rims are rated at 940kg and the 19" - 20" rims are rated somewhere between 860 - 900 kg.  I would ask the seller to have a look at the load rating cast into the reverse side of the rim.
If the load rating matches or is higher than D3 19" rims then there will be no issues.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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