I've come across a button maker and 500 "blanks". I want to say that this is what they looked like when we redid the upholstery in our 1973 Charger, but am not sure(was 7-8years ago). I wouldn't have thought of it possibly being useful when I first saw it, but a couple were sitting in the box in blue and it made me remember the Chargers seats. I'm sure most people just reuse the ones you took off, but maybe not. I don't see anything on Legendary's website. There is an actual press that was in another part of the garage at the estate sale but I didn't think anything of it. Now I see the instructions showing it, which would make this a lot easier to make them. The lady said they might have another auction and they still had a lot of stuff people didn't want and left there. Hopefully that press is one of them so I can get it.
I'll upload a picture on my phone in a second. The buttons is a "size 30"