19 inch wheels, offset for 348

No luck when searching archives so does somebody know for sure/have experience that which is the offset range that should be used if you want to put 19" wheels for 348? Rim wide would be 8-9inch in front and 9.5-11 in back. i.e. OZ has nice looking 3-piece Superleggeras that fit 360, but haven't got answer will they fit 348, size is 8.5"(ET 27) in front and 11"(ET 34)in rear. So simple question, will they fit 348?
I haven't found any decent wheels shop that could do more than checking from manufacturer's manual will they fit and all of them just says that they don't have wheels for 348. I very much prefer 19" wheels as they look much better IMO. And yes, I know it will make ride harsher but I will also keep the original wheels and no, I don't want to put 355 wheels on it.

 

Using a different diameter you still keep your same offsets (unless you wanted to change them anway).

 

Stock wheels should be: 7.5" (ET +49) front; 9" (ET+68) rear.
Currently I'm running with 15mm spacers and think that wheels could come more "outside" to fill wheelarches. I would like to know what wides/offset people has used with 19" wheels in 348 and still haven't face rubbing against wheelarches etc.

Possible tyres for those OZ wheels mentioned could be 225/35/19 front and 285/35/19 rear. That would make diameter to be 5mm bigger in front and 20mm in rear compared to stock combination.