DeepDive,
The factory lugs probably won't fit in the spacer holes. I seem to remember the factory lugs having an extra wide diameter, which in my case, kept them from being usable with the spacers.
Like Todd said, they should have requested that you specify the thread pattern of your stock studs - and sent you enough lugs to mount the spacers to the hubs. If not, you'll have to buy a set from an auto parts store. If your spacer studs are made with the same thread pattern as your factory studs, then you can use the factory lugs to mount your wheels to the spacers.
Good luck.