With lots of degreaser, paint remover, and then some elbo grease, I found "57L103175" on the frame rail where you said it would be. Couldn't find another smaller plate anywhere. Should it be near the "generic" plate?
Looks like I have a real mixed bag of stuff. '57 frame, at least some '56 body parts, and who knows what else. :confused:
With the 114" wheel base, Im guessing the complete VIN should be 3A57L103175.
Thanks again,
Ricky Bob.