The 53-53 has a "wider " center of the "tail" to match up with the wide moulding used on these cars.

51 the letters are in black... the 52-3 they are red

Here are two sets I have on the shelf. More difference than I thought.

Thanks Kerry, Pics are always appreciated!

Thanks everyone....I had no idea they were that different. Terry

Also Terry, in '50-'51 the Commodore/Hornet badge starts between the belt-line and the bottom of the fenders,doors,quarters and goes back to the pork chop.. Starting in '52, they are located on the edge- center-beltline- of the body roll. The trunk badge in '54 is different too.
We stock both of the retainers for these moldings.