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As Tim Ayers suggests, I recommend that you find the Dorman Hardware catalog online and search through the extensive listing of wheel studs. I suggest you try to find one with a knurl diameter smaller than 0.641. You should be able to find studs with close to the right knurl and shoulder lengths and diameters to work with your specific hub and drum. If either the knurl or shoulder is too long, they can be easily shortened in a lathe. Some early hubs may also require that you "clip" the heads. The attached photos show how a stud had to be modified for a perfect fit, but this was not for a 39.