John302,
Congratulations on your find. I tried to find the same type emblem from my hometown Chevrolet dealer (opened in 1966) but with no luck. I had the idea to cut the attachment prongs off the back (I did not want to cut holes in my back panel to permanently mount it) and affix magnetic sheet material to the back it, and neatly trim away the extra material as to not show from the front.
Can you post a picture...I'd like to see it.
In fact, it would be great to see anyone’s 1st Gen’s with the original dealer emblems still attached!
Thanks