Porsche 5 x 130 bolt circle with diameters of 17-18." Widths 8-9.5 with offsets 55-70 mm. Ideal wheel to start this long-term line would be a 9 x 17 with an offset in the 65-70 mm range. Expansion to other sizes, as outlined above, from there. Cost and quality are the same issue, one must have both. Clearance for the standard Porsche (Brembo) 4 piston brake caliper an obvious requirement. Thanks for considering building this fitment. Growth is important for any company, what would we add after this Porsche product line? Six bolt wheels for the Cadillac CTS-V and Dodge Viper. I look forward to hearing from those who can meet these specifics.