VIN Rivets

Do you any of you guys have a source for the rosette rivets for the a '66 Dart? Obviously, these are attached in the door jams, so I'm unsure if they are the same rivets as the later model A-bodies that seem to be the rivets that the resto shops like ECS carry.
With most every Resto everyone’s needing the Rosette Vin rivets. I see the for sale on a lot of web sites, eBay n other places. They sell 2 ea and are high priced at over $50.
So I was thinking I’d take 2 round rivets get my round jewelers file n set at my work bench n use my lighted magnifier n make me a few sets. Maybe sell some too or give them away to my buddies.
But if they’re out there for sale where is the source to buy them by the box full?
Happy Moparing