The casing has two parts. Porsche sells each of them separately. IIRC, about $25 each. You only need to buy the one you are going to replace. The button piece is really easy to replace. Just pop it off and snap the new one on. The other side requires one to take the button side off, remove the battery and electronics, and the key itself. Still pretty easy, just takes more time. No need to take the key to the dealer and have it reprogrammed.
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