I had my passenger wing mirror completely smashed off. There is a casting inside that sheared. I searched ebay and found a scrap dealer in the midlands. The mirror was not actually advertised, but alot of traders place a few car items on ebay for sale purely for advertising. In my case a
NHB rear bumper was advertised, I called the salvage yard to ask if they had the
NHB wing mirror, which they did. I paid £75 plus VAT plus delivery. I think the colour coded panel costs less that £15 if you can't get the right colour, I guess I was lucky. If you are mechanically minded, the powerfold mirror can be stripped & rebuilt just in case you are trying to make one good unit out of two damaged ones. The major problem is the spring retainer refit and you will need to remove the electrical plug to thread the wires through the mirror. I should of taken some photos to explain a bit better. Hope this helps you