Technical Help needed identifying a vintage Chrysler part

I've got this NOS part in its wrapping from an Imperial owner who had several '52-'54 Imperials. The part number is 1439-404 and is a molding but I can't figure out what it is or where it goes. Anyone with Mopar parts books to help me with this? Thanks in advance.

 

usually a picture gets more results than a number.

 

That's true with a lot of parts and even some unusual moldings but this is still wrapped up in its' original Mopar paper which would have to be cut off. It's just a long straight molding with a slight curve at one end.

 

'54 Custom Imperial R. fender molding ....

 

I knew I just knew someone would be able to help. Many thanks.