I think they all come as one piece.
Ebay sells the 3 stalks a lot because of people upgrading to the 4 stalk versions to take advantage of the on board computer that's on every boxster.
You can pick up a 3 stalk cheap or pay about 125.00 on Ebay for a 4 stalk and have them turn on OBC at the dealership when it's replaced.
If you PM me, I can email you the directions on how to swap out the 3 or 4 stalk units in about an hour or so... not hard, just a lot of bolts and wires to unscrew and disconnect. It's a pictoral so that makes it far easier.
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