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No one has mentioned it so far, but you will also want to lift/remove the trunk liner and boards on the side where you saw the leak and check if there is coolant in the trunk under the boards.
If there is coolant under the boards then you likely have the very common failure of the coolant tank. At 15 years of age it is likely to be in need of replacement if it has not already been replaced.
You may want to check this before you order a new cap.
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1998 Boxster
1991 Carrera
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