1963 Valiant
The 63's front fenders don't have the inner headlight bucket that the 64-5 grilles attach to. I actually have a 64 right front fender on my 63, all I had to do was drill out the spot welds for the inner bucket and - voila - a 63 fender. Doing the reverse - adding the bucket to a 63 fender wouldn't be so easy, since you'd have to add something that isn't there instead of removing something that is.