I would love to upgrade my standard 2005 steering wheel to a multi function job at minimal cost. Z4 m ones are rare and expensive. What else fits and works with minimal engineering? Having searched there isn't too much info. On other sites some say 3 series m or otherwise is a straight swap physical and electrical....others say no...im confused...would like it to be true as there are loads of 3 series mfsw m and non m for much cheapness. Anyone to provide clarity....im confused.