Nice wheels. This is pretty common here, in Japan, Taiwan etc. Lots of aftermarket wheels are either cast or forged out of aluminum (filled) and then machined to the customer's PCD and hub size. From your pix it appears that did a pretty good job with them.
Like TRK mentioned, all you need is a lug bolt kits with the cone, not the ball. I (and TRK) could be wrong but I also think you simply need a kit like those:
In black of course. The lugs kit you previously got can be sold here easy I'm sure and you won't lose more than a few $ doing so.
I'd say just get on with it man, those are some sick looking wheels that you want to keep - I can hear your sport car screaming for them to be installed
