find VIN# on a `51 fleetwood

[gabe]

Hi,everyone,
I need some good adwises to find the VIN # on a barnfresh `51caddy fleetwood.
I use to have a `59 Coupe De Ville,and I had the same problem to find the numbers.Eventually,after 5 months ,we found one on the frame,in the engine bay.
Even though , another half year later during the restoration, we found on the frame anotherone ,with the same numbers, right under the trunkfloor.
So,how about the `51 numbers?
Thanks!
Gabe