Those look to be skm calipers. I just rebuilt some that were the same kind. Fastech-racing and Italian Motors have skm brake parts.
ridolfi righetti maybe, they seem to be inexpensive.
I have a friend with a complete, almost new set up off a Top Kart (they should fit, as they look SKM also.)
Hubs, spindles, rotors, etc. I think they were only used once if any
I can contact him, if interested?
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