drm is using aftermarket studs....the stock studs are used to bolt down the spacer that has the aftermarket studs built into it. You're still bolting the wheel down onto an aftermarket stud. You've effectively doubled the number of points for a moment which means more possible points of failure.
http://www.stillen.com/product.asp?id=HRTRAKSP01
DRSŪ Series
DRS Series spacers fit between the wheel and hub, and require exchanging the existing wheel studs for longer ones (studs are included).
DRMŪ Series
DRM Series spacers bolt to the hub with existing wheel studs and special nuts (included). Wheel is bolted to new DRM wheel studs.