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Do a search over on the 993 boards at Rennlist. There are several threads on this. Apparently the numbers are supposed to be on the immobilizer unit under the left seat. Don't know for sure if it's true for all or if the immobilizer has been replaced. Also don't know how common it is to have the immobilizer replaced. I will look when I pick up my new to me 993 next week.
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