Based on this product's specifications, here are some alternatives and similar models
Roborock main brush gearbox for S6 / Black / MaxV — replacement drive assembly
Summary description:
Replacement main brush gearbox compatible with Roborock S6 and Black / MaxV series. This gearbox houses and drives the primary brush assembly to restore brush rotation and cleaning performance after wear or failure. Intended for maintenance or repair of the vacuum's main brush drive, it helps maintain effective brush action and floor cleaning results without altering other vacuum components.