The original kits came with the holes in the rear cover already punched/drilled.
The emblem used on the 58/59 was the nose bird which is the same for both years.
I have never seen a 60 kit but would assume that the nose bird for the 60 could be used on the rear cover. My guess is the 60 bird was never used by Ford and they continued to used the 58/59 emblem on the 60 conny kits which probably carried a B8S number.
Occasionally one sees a 60 bird with a conny kit and the 60 emblem.
I did have a NOS kit put on my grandmothers 58 during restoration.
Sun Prairie, Wi.