Donner DDP-80: Difficult to Find Contacts

I’m looking for an obscure replacement contact for a Donner DDP-80. They’re extremely secretive about parts, do not seem to have a way to apply to be a service center, and this is outside their short warranty window.

The contacts themselves are almost identical to some Yamaha P-series contacts, but they’re spaced evenly (rather than having ever-so-slightly different widths).

They’re subtly different from anything in my inventory, which makes me worry they’re proprietary.