This is the original Porsche SportDesign rim, which is a 2 piece rim that is screwed together. Porsche code XRL. Was available for 986 and 996.
There are a lot of fake rims out there that look like that. But they don't have a Porsche number and in general are not 2 piece. For example this RH rim:
So check if it has a Porsche number and is made from 2 pieces that are screwed together.