Reply to "What are the Pros & Cons of Magnesium vs Aluminum Wheels"

Ok, here is the question: How much thread has to be exposed and out of the wheel for the lug nut to grab onto for it to be considered safe?  With the current studs, there is only 1/2 inch of thread that extends past the wheel's stud holes.  The stud holes are very small in diameter, only 13 mm, which is 0.512 in.  The black lug nuts pictured above by tsolo look really good; however, the shank diameter is 0.61 in. and thus would not fit inside these wheels' stud holes.  I need lug nuts with a shank diameter maximum of 13 mm, or 0.512 in.  I can't seem to find them.  Does anyone know where I can get some?  I am trying to avoid changing out the studs, and as joules explained, it sounds like a pain in the butt.