You’re probably better off asking on the RME forum, they’re pretty helpful over there.
https://forum.rme-audio.de/
I imagine most non cheap ones from Amazon will work. But RME sell a replacement if you didn’t get one in the box, or bought pre usb c being available
https://www.rme-shop.com/acatalog/RME---USB3-Cable-for-Babyface-pro-and-FS.html
Also bear in mind your latency might be something else entirely. But definitely test it without a hub first