Which microrotors are compatible with my Universal Geneve?

I have a Universal Geneve Caliber 69 with a loose microrotor... I'm trying to look for a replacement part for it, but I'm not sure which other microrotors are compatible with it. A watchmaker told me that I might be able to find one that fits from other brands, but I'm not exactly sure what I need to be looking for to try to find a replacement. If anyone has any advice, it'd be greatly appreciated. Thanks!

Repairing a worn Microtor – from calibers 215-218-68-69
https://universalgenevepolerouter.com/repairing-a-worn-microtor-from-calibers-215-218-68-69/

The bearing unit you need to replace is only found on caliber 68, 69 and 1-69 calibers that i'm aware of.
You can swap over an entire rotor assembly from any earlier 215/218-based calibers, though they are not technically "correct" parts.

Scotchwatch or one of the listed repairers sometimes carry parts:
https://universalgenevepolerouter.com/service-repairs/