NOS pedal pads in the box to what cars/cars?

I bought a bunch of pedal pads and have very good reference books to visually identify them as well as the web so I'm a bit surprised when I run across a set that seems very common that I can't find like the ones I have here. They don't seem to match anything I have seen or can find. They are a matched pair in separate boxes with the same NAPA part number. That being said and I believe a late 50's or early 60's manufacturing date should make them for an American car but I can't find a single one anywheres on the web and they don[t match a single pedal in my books. Closest match is a mid 50's Ford but that's incorrect. Any ideas or Wild guesses?

NAPA still uses Belknap as a supplier. Maybe your local store could cross reference the number for you.