I do not have hubcentric rotors.
I also have wheel studs, so Im not too worried about the lug nut seat shape.
FWIW, in case anyone searches and finds this thread in the future, here is a good old thread I was able to find on these wheels w/offset info:
http://www.914world.com/bbs2/index.php?showtopic=69869&I looked at the VTO/former Pack Racing site again and it looks they will drill the 15x7 25mm offset wheel in any lug pattern. I also saw that a lighter weight option for the wheel was mentioned in an old thread so I will ask about that as well. I'll call them on Monday and follow up here if I buy anything.
Thanks again for the info.