This may or may not help but seems possible.

https://www.classicparts.com/1951-87-Vent-Assembly-Rivets/productinfo/03-825

https://www.classicparts.com/1951-87-Vent-Rivet-Setting-Tool/productinfo/03-835/

When restoring a truck, one needs to get familiar with vendors who specialize in the parts. Get good at searching those vendor sites. This took less than 12 parsecs to find.
No problem, just FYI. You can thank your Lucky Stars I'm here. Whether you own a "Mercury Comet", a Chevy "Astro" or a Plymouth "Satellite", parts are in this Galaxy. (sorry, I read your profile)


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn