1) Welcome to mercedesshop.com

2) This does not sound true, IMHO; you may wish to contact Peter Lee at Wheel Experts for specific wheel sizing/offset/application questions:

Peter Lee - President
Wheel Experts Automotive Group, LLC
Voice: (281)494-9700
Fax: (281)494-9701
email: peter@wheelexperts.com
web: http://www.wheelexperts.com