[DavidG]

Apart from the entirely valid concerns regarding taper and diameter, what about the metallurgy? The color of a NOS ball stud tells you that it has undergone heat treating and the colors of the reproductions in the photo above shows no such evidence. These are kind of life-threatening parts if they fail in use. Does anyone believe that the metallurgy of these parts and others like them are equal to the originals? Not I.