Based on this product's specifications, here are some alternatives and similar models
Dust Filter for Lian Li O11 Dynamic Top, DEMCiflex (model 1103) — black
Summary description:
DEMCiflex dust filter designed for the Lian Li O11 Dynamic Top (model 1103). This black top-mounted filter provides dust protection for the PC case by covering intake/exhaust openings on the case top. It is intended to reduce dust buildup on internal components, simplify maintenance and improve airflow cleanliness for desktop gaming or workstation builds.