Suggest you ask on the 991 forum. Better chance of an intelligent answer from experience.

There are generally three manufacturers for Porsche at this time. Two out of the three are Italian companies. The least found on cars today are those by Fuchs. (Yes, the same guys as in the 60s, 70s and 80s). RRS also makes them in Italy, and then their usual guys, also in Italy. The Italian guys make the pressure cast ones--Fuchs the forged. I seen to think they may be by BBS.

 

Those are some good leads and suggestions, thank you!