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					Originally Posted by  piper6909
					 
				 
				If it's aftermarket, then most likely a 19mm 12-point socket will fit it.  Beat the socket onto the lug head with a hammer, then spin it off with a ratchet and a pipe extension, if you don't have a breaker bar. 
Use a Craftsman so you can exchange it once you've ruined it!    
			
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As noted in my update above, I think it IS genuine Porsche lock.  The key in the picture is very similar to my key.
I will contact the parts department tomorrow and ask if they have wheels keys for the senior-citizen-cars like mine.