This is the socket needed for the transmission drain plug on the 986 5-speed. It's the Hazet 2567-16, which is a tamper proof 19mm 12 point 1/2in drive. I bought it before I realized that I don't need it for my 6-speed S tranny.
Fondled but never used, I paid nearly $45 for it ($38 plus shipping). It's yours, shipped to your door, for $35.