The driver's side mirror on my wife's 1998 e320 is producing blurred, " double vision" images. Otherwise, it adjusts ok.

Questions--

1. Is this fixable or a problem that means I need new parts?

2. If new parts will be needed, can anyone point me in the right direction re what part(s) I will need,where to get them and about how much I'm looking at?

Thanks!
Carl Crowley
Atlanta GA