Well, I got the hubcentric rings from
http://www.ashspecz.com, and they are pretty much the same thing as you'd see for hubcentric rings for wheels that are too big for your hub, i.e. made from polycarbonate. It's said that the stuff doesn't melt and is better than metal... I guess we'll see although I remain scepticla on the materials ability to withstand the heat cycling of the brake rotors....On the other hand, LOOK! 17" wheels can fit the 13" rotors with a 10mm spacer (sorry no info on the wheels sock offset, forgot to look) --->
If the above doesn't work then here:
More info and pix later!sil80