Based on this product's specifications, here are some alternatives and similar models
Dust filter DEMCiflex for Lian Li O11 Dynamic Side (black) - model 1106
Summary description:
Replacement dust filter DEMCiflex designed for the Lian Li O11 Dynamic Side case. Black mesh filter, model 1106, protects internal components from dust while maintaining airflow. Suited for side intake on compatible O11 Dynamic variants; easy to install and remove for cleaning. Ideal for maintaining cooling efficiency and prolonging component lifespan in desktop PC builds.