Technical Can you identify these chrome fins

My friend passed away and we have been finishing his Merc to sell for his wife and also clearing out stuff in the garage. I was wondering if anyone knows what these are? They look like tail fin chrome similar to Packard. They have 53 stamped inside and also the size of the holes required and mounting stud size so I'm wondering if they are an aftermarket or accessory item. They are chrome - the color is just a reflection from the wall.

 

51 or 52 Buick.

 

1954 Plymouth Belvedere

 

54 Belvedere looks a lot closer than the buick. perhaps a different model?

 

1954 Dodge Mayfair. Canadian Dodges had same bodies as U.S. Plymouths

 

All Riiight. We have a winner. Good to know.
My pop's first brand new car was a 53 six Gyromatic ( American ) Dodge.
Uncle got a 54/ Hemi at the same time.

 

Well that didn't take long. Thank you very much.

 

It’s just to dang easy !! By the church of Mopar , what is , what was , and what always will be . From this day forth let it be proclaimed throughout the land . Any WASSIT thread answer will forever be a DODGE !

 

"Don't you blasphemy, now! Don't you blasphemy!" (credit Aretha Franklin in "Blues Brothers")

 

May she rest in peace.....