Burg Boxster has it right, your Porsche dealer can help ID the key you need.
I found that my boxster had no key for the locking wheel lugs, my dealer removed them with his "master" set and said I had a #2, I chose to replace with 4 standard lugs rather than order a key, I think the total was less than $50 for the lug nuts he charged my no labor. I just didnt see the theft threat being enough to worry about the extra hassle of locking nuts.
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