Replaces part #923587-02 and 922676-01? I definitely have a multi-storey Dyson DC40 car that needs these part numbers. The aftermarket filters in this pack are slightly different from the factory filters. The post engine filter fits well but it is too small and not tight leaving a 1/4-3/8 inch gap for the entire exhaust to exit rendering it useless. The pre-filter doesn't want to sit and pour into the canister.