I found a site who machines custom hub centric rings for about 20.00 a piece but they have a 67.10 inner bore and 74mm outbore which fits my rims (giovanna DBLG 505 series) for about 7.50 each which are already made. Do you think the 67.10mm is too big being that our inner bore is 66.9mm?

Web site http://www.prestigewheel.com/mainHubRing.htm

That's barely .004". I wouldn't worry a bit.

10-4

Yeah, it'll be fine.