Yeah, I think youre right!!
i listed these originally as a 17" rim.. but, ive found some diff tech info on the net.?? (probably specs for the other rims they sold for on the Evo9) and for a 17" rim they have a large side wall which would make them look like an 18" rim.. sorry if theres any confusion.. its not intentional.. ill try to find a more trusted spec chart.. as of now.. your on youre own for looking this up.. but, they WILL fit a Mazda no problems.. and theyre nice and light.. that I can guarrantee!!