Hi Rahulio,
Greetings from Australia. I'm in the same boat. I've just bought a '90 300CE, & don't know what is available that will fit my vehicle. The replica copies that I like are in 17 x 8 only, and all the tyre (sorry, tire in US) companies say 7.5 max width. I'd like to hear from any/all 300 owners if they have fitted a 17 x 8 rim & with what tyre sizes, to give an honest appraisal as to clearances available (both outer edge to fender, & inner edge to strut), & any rubbing problems (did the lips have to be radiused?).
Cheers, Marc.