First of all - welcome to the world of Porsche.
Go to Porsche.com and download what's called the PET - also known as the Porsche Parts Manual.
found here:
Porsche Classic Genuine Parts Catalogue - Classic Genuine Parts & Literature - Porsche Classic - Dr. Ing. h.c. F. Porsche AG
Around page 167, you'll see the parts for the shift linkage. All these bits are accessed either by removing the gearshift bracket (1 on the diagram) or by removing the tunnel cover (under the carpet, on top of the tunnel, in front of your rear seats).
If you are struggling, search for "shift linkage" or "shift coupling" or "Shift bushings". And - buy Wayne's 101 Porsche 911 projects Book. Very useful.
My guess is that it's the "friction ring" - #22 on my diagram or the ball socket #23.
If you want to re-do your shift stuff - order all three. Also - adjusting the coupler is interesting, so that's another search.
Good Luck.
Ken