I know this is an ancient post, but I am currently using their black chrome version of these, the 64015s, on the factory wheels.
GREAT so far, as I do NOT like lugs which stick out too far (asking for trouble, BESIDES the additional, unnecessary added weight, even in the center of the wheel).
IF they made these in an even shorter yet, lighter, open ended version, I would get them for my Pro Race 1.2s.