How to find the part number of an item on a car? Ford Escape 2013?

Hi. I need to buy a new side mirror for my Ford Escape, coz they were stolen. Most websites ask for part number, but I have no idea how to get that, since the actual mirrors were stolen. Any ideas?

$300

Try the Ford dealer or ebay

Try this…

http://www.autoanything.com/mirrors/10A50630.aspx