I don't believe there are any stock 15" Subaru rims that will fit over the WRX rotors. 
 
I do believe the Rota Slipstreams in 15" will fit... I think those are the one's that Art's thinking of.  You could potentially keep the tires and get a set of slipstreams so you can run them on a WRX, but I doubt that's really worth it, since most people seem to want 17" rims for their WRX, leaving the stock 16's as a great set of snow rims.
		 
		
		
		
		
		
		
			
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