Sean is exactly right. I believe that Porsche sells only the complete ignition switch and tumbler, but the part that fails is the switch itself. It is Audi part number 4A0 905 849 B and should be available at any VW/Audi dealership. The part isn't expensive, but replacement can be a back-breaker. I just had mine replaced and was billed 1.4 hours labour - worth every penny for someone with a couple of herniated discs!
Brad
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