#27501, "RE: rotor warping, lugs and rings" In response to In response to 19
From the Comprehensive Specs on Info & Specs from the Main site, the inside diameter needs to be: Centerbore = 67.1mm
(it is a fairly common size, shared with Nissans, Fords and Mazdas sporting 5x114.3 hubs)
As for the inside diameter of the wheel (the outside diameter of the hub ring), I guess you'll have to contact the company that manufactured it, or maybe knowledgeable places that sell it. Or try Google?