For the person looking for a 57 body shell, try Dr. Mopar in central TX.
Here is his web site address
http://www.drmopar.com/
I know he has at least one 58 (its hood is now on Hugh's car). He had
quite a few early fin Imperials, and one of them could be a 57. Good luck.
D^2, 2x68s, Austin TX