Based on this product's specifications, here are some alternatives and similar models
Aquarium accessory Fluval suction cup bracket for 303/403 models (A1217)
Summary description:
Fluval suction cup bracket A1217 is an aquarium accessory designed for use with Fluval 303 and 403 models. The bracket mounts securely using suction cups to hold hoses, intake/outlet components or small accessories in place, helping organize filtration parts and maintain tidy equipment placement. Suitable for freshwater and saltwater setups; easy to install and reposition.