[jakeru]

According to the Porsche 986 USA parts "katalog", there are 3 different part numbers for rear swaybar bushings, depending on the swaybar diameter, which depends on the car's options:
996 333 792 24 (18.7mm swaybar diameter),
996 333 792 28 (19.2mm swaybar diameter), and
996 333 792 25 (19.7mm swaybar diameter).

For front swaybar bushings, there are also 3 options:
996 343 792 14 (for thinnest swaybar),
996 343 792 12 (for medium thickness swaybar) and
996 343 792 17 (for thickest swaybar).

I'd recommend measuring the actual od of the swaybars on your car with calipers, although you'll need to research front swaybar diameters, to be sure. You can also look up specific options on your car in the parts catalog.

It's possible that there are superceded part numbers, but hope this helps.