Retrofit is plug and play for 2005-2009 w211 Models
For 2005 clients: It is your responsibility to insure your build date falls into the 2005 category for your model (some of these 2005 cars have 2004 modules)
This is a complete package with everything you will need for a retrofit.
 
Wheels do not include a heat function.
 
 
 
notes:
Not all buttons will function on the retrofit steering wheel. You will not gain any function nor will you lose any function