Given they changed the nose for 2013, you'd be looking for a part number that starts in 'D', which appears to be DR3Z-8C291-AA on the Ford Parts website. I'm sure someone else can verify, as I don't have a 2013-2014 car, but that's what the official Ford parts website is bringing up (and google images of 2013-2014 engine bays match the below picture). The 'A' part prefix started in 2010, so you can go through the alphabet as the years go on. The letter prefix will be the year the new design started, so a 'D' part can still be on a 2014.Some interesting things we are learning as we go along, would someone be able to confirm what their radiator upper shield part number is on their 2013 or 2014 GT / Boss?
I ordered BR3Z-8C291-AA as that seemed to be the correct part when I followed the parts diagrams (Part "3" Here) However it's not the correct part. Interestingly when you look at that parts listing the images with the diagram of the part look correct, but the picture of the part is different (for instance no indent at the rear for the coolant expansion tank hose). What I have is like the image, not the diagram.
2010-2012, 'AR3Z' version
![2011.PNG 2011.PNG](https://trackmustangsonline.com/data/attachments/69/69722-a2e0efb72380384b8a419eb8ff2cc8c9.jpg)
2013-2014, 'DR3Z' version
![2013.PNG 2013.PNG](https://trackmustangsonline.com/data/attachments/69/69723-3b22563279f7bc3320790767375d220a.jpg)
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