Some kinda gm... the clear lenses look to be the same as 53 turn signal lenses. for some reason I'm thinking oldsmobile
Not US Pontiac, but if I were going to guess I'd look for pictures of 53-54 Canadian Pontiacs, which are basically a 53-54 Chevy with the Pontiac grille and some other trim changes. Is there a number cast into the lenses? That's usually the first year they were used on a car.
If they're Mopar they'll have the first two or three letters of the make cast right into the plastic.
Nice close up! Desoto tailights.... GM taillights would have been by Guide and and have the year in the plastic letter-2 numbers G-53 etc.
You know, so many of those things got junked for the Hemis I don't think I've seen one in a junkyard in over 10 years.