The bits are the turn indicator canceling mechanism. Clearly, this is why it no longer functions.
The entire assembly must be replaced as the parts are not available separately, so you cannot repair it. That means new wiper/turn indicator/cruise control stalks along with the center piece and electrical connectors. The stalk covers will not be included and will have to be either purchased separately or swapped from the existing unit.
If you don't have the OBC function w/ 4th stalk, now would be a good time to consider the upgrade.
Contact Sunset for the best new prices of try to find the unit at any of the reputable wreckers: LA Porsche, Oklahoma Foreign, etc.
