For my metal kilt jacket buttons, i'm looking for not o rings, but the cotter's pin types.You can see an image here.

https://m.media-amazon.com/images/I/...AC_SL1500_.jpg

This is a us navy type, with crimped end so it's not removable from button. That would be the ideal, do you know where these could be sourced?

Thanks a bunch

I am not looking for the open ended type if preferable:
https://www.warsendshop.com/products...-shank-buttons