I already have several sets of the strap part. Only one chrome set but several black.Hit me up if you buy some. Could use 2 sets of the strap part.
I've seen several manufacturers for them, this was just the first one in the Google search
https://www.sweetwater.com/store/detail/0994914000--fender-american-series-locking-strap-buttons
That's not a Schaller and not a Hennessy. Fenders come with Shaller buttons (at least they used to). Both of those are beveled and this one is clearly not. What brand strap locks is this? Have you contacted the manufacturer? That button almost looks like what comes with the Marvel strap locks from GuitarFetish (Hennessy style).
Oh, that's the Dunlop style...not Fender or Schaller.