I've bought this brand before and they are of good quality. However, the ad states they fit my vehicle and various other Porsche's, but you can see from the attached pics the spherical seat is not the same and they are not even the same size. Will a 2mm difference be an issue? I don't know for sure but I'm sure not taking any chances. The stock Porsche lug bolts are 19mm and these are 17mm. They are clearly not the same and should not be advertised as such.But, the bolts are good quality and if you ensure you get the right size, you'll be fine.