We had the wing mirror on our last (2013) SE Nav knocked off by a passing van, the result was shattered glass and mirror hanging out by wires. Like yours, the little plastic clips that attached the glass and the little stem were broken.
The auto-chromic glass for the SE Nav variant is ~£250 on its own. I tried our dealer to see if the inners (motor etc) could be replaced to save replacing the whole painted unit - Answer was no, it's a whole new wing mirror. Cost new £600 (with glass). They come pre-painted using the VIN.
After I found out the cost we went down the insurance route and had it done through an authorised body shop..
Hope that helps?
Edited by: Lazarus
Antara 163PS: Bluefin Remapped to 210PS