I'm thinking about fitting larger alloys on my W210. Currently they are 15'' but what do I have to bear in mind when I go up a few sizes. Would wheels from any other E-class fit straight on? I know I have to consider arch clearance. What would everyone consider a good size <img src="http://www.mbclub.co.uk/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''> . Do I have to quote the "off set" size when ordering or should a good supplier already know the exact sizes etc. Please excuse ignorance, last time I changed wheels was on a "Escort". Thanks everyone <img src="http://www.mbclub.co.uk/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> .