Differences in Formula S Emblems

Any feedback on the 66 emblem on the 65 fender?
The fender I was going to try the 66 one I have didn't work with the hole the previous owner put in the fender. When I get back to it I'm going to open them up a little bit. The 66 one I have is complete flat without any sort of curve that the 65 fender has.
Pishta shown an example of the amount of curve the 65 emblem has, (not very much at all) but i think it is what it's going to need to set on the fender correctly. I examined a V8 emblem from a 65 and found it has the same curve.
I'm toying with the thought of taking a drimell sander to put a slight curve to the 66 after I find out how far it sets off of each end of the edges.