What kind of wheels are they (supposedly)? If you can post a picture of them, I can probably tell you if they're real or not.
Yes, I am (again, supposedly) the resident Porsche expert. At least, I am a CPN.
Design 90's were never really that popular to replicate, at least not as popular as the later wheels (the Cups, mostly) because they came on most, if not all, Porsche model lines of that era. Chances are great that you wheels are indeed the real deal. I believe there was a company that replicated them, but that was a long time ago. These replica wheels however, are usually not forged, but rather they are cast.
One thing about Porsche's wheels, is that they are nearly perfect. If they have manufacturing blemishes, or look to be of an inferior grade of metal or craftsmanship, then they are probably not genuine.
Overall though, without seeing any pictures, and given the relative commonness of these wheels, I would say you are more likely to have a set of the real article, than not.
Weight should be a major factor. The good porsche wheels were forged and didn't way that much, but they also made some cast wheels that did weigh a lot. If they are OEM they should have a porsche stamping on the back of the wheels somewhere. The Design 90's, cookie cutters, phone dials were not replicated much to my knowledge, but all the newer wheels were replicated to no end. The Cup1, Cup2, and Turbo Twist wheels were the most replicated.
A forum community dedicated to all Volkswagen owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!