Based on this product's specifications, here are some alternatives and similar models
Pet litter box filter Dogman 719001, black, 120×120 mm, for Bonnie and Clyde
Summary description:
Replacement pet litter box filter Dogman 719001 in black. Measures 120×120 mm and is compatible with Dogman Bonnie and Clyde litter box models. Designed to trap dust and fine particles from cat and dog litter, it helps maintain cleaner air and reduces mess around the litter area. Easy to install and intended for regular replacement.