Seems like there is some type of stopper/bolt/plug that needs to plug one of the nipple. Porsche optimized the production or inventory so they don't have to keep two different parts. Let's see what I get from Pelican. One of the picture on PET shows 90031204201 as bolt which would plug the nipple on left side of throttle body.
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2003 Boxster-S.
Black with Tan interior.
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