One of my mirrors doesn't lock into place as it should it still functional but I want to replace it I went to eBay start looking . I founda lot of really neet aftermarket mirrors but they say they go up to 2005 K450 . What is the difference between that and the 2006 W450 . I understand there is some body panel differences but does that affect the mirror placement or mounting pad? Also does driver position matter when it comes to mounting mirrors?. They are both electrical adjustable.