Help me figure out what this is from.

I found this old NOS part in my fathers garage and cant figure out what it is for. The GM part # on the box is 147459 and is labeled as an extension, hand written on the box is a 1968 Cadillac and on the other box a 1967 Cadillac. I researched those years cadillacs and found no part that looks like them. I think it is a left and right hand sided as well, can anybody help???

 

Well, I've never seen anything like that, either! Oh, wait--I can't actually see it at all. Could you please post a pic?

 

here is the pic

 

It is made of aluminum as well.

 

They look like side trim moldings or maybe interior trim moldings but I have never seen anything like that on a Cadillac.

 

Grille extension 55-58. Here's one from a 63 I found while researching yours.

 

Sorry, Im just not finding it on a 55-58 Cadillac? Are you sure about those years? Maybe not cadillac?