Based on this product's specifications, here are some alternatives and similar models
Brush guard for robot vacuum Xiaomi BHR5921TY — white, 65×25×21 mm, 1 pc
Summary description:
Spare brush guard for Xiaomi BHR5921TY robot vacuum. White plastic guard sized 65 × 25 × 21 mm, weight 0.071 kg, sold as 1 piece. Designed to protect rotating or side brush components on compatible robot vacuums, helping prevent debris buildup and minor impacts. Suitable for maintenance and part replacement to restore brush function.