W212 18s on C218 CLS

[jke11y]

I am going round in circles here trying to work out what will fit; willtheyfit.com says that this will make the front wheel 13mm closer to the suspension but i am not sure if that is a problem or not?

STD CLS 19s
front - 19x8.5 ET34.5 255/35/19
rear - 19 x 9/5 ET48 285/30/19

W212 18s
front - 18x8.5 ET48 245/40/18 dunlop winters
rear - 18x9 ET54 245/40/18 dunlop winters.

Any help much appreciated!