Based on this product's specifications, here are some alternatives and similar models
Pre-motor Front Input Filter for Dyson V8 / V8 Focus Mattress by JETtools (MPN SB11032)
Summary description:
Pre-motor front input filter designed for Dyson V8 and V8 Focus Mattress models. Manufactured by JETtools (MPN SB11032), this replacement vacuum filter fits in front of the motor to capture fine dust and debris before airflow enters the motor housing. Intended for regular replacement to maintain suction performance and prolong motor life; compatible with V8 series vacuum cleaners used for general home cleaning and mattress allergen control.