Based on this product's specifications, here are some alternatives and similar models
Dust Filter for Lian Li O11 Dynamic XL rear – DEMCiflex 1096
Summary description:
Rear dust filter designed for the Lian Li O11 Dynamic XL case, manufactured by DEMCiflex (model 1096). Serves as a replaceable mesh filter to block dust ingress at the case rear while maintaining airflow. Ideal for PC maintenance, reducing dust buildup on components and simplifying cleaning for users who want to protect hardware in home or office systems.