1986 original wheel locks

I discovered that I am missing the tumbler for one of my original wheel locks. it is the type that actually uses a regular key, and not a lug bolt wrench type key. Any information where I can get a replacement? I realize that it might have to be rekeyed to fit my original 41 mm key. Thanks

Best bet is to contact the porsche dealer, but more than likely you will need to buy a new set of 4 with a new key.