DOP07-213HU66 Husqvarna 66 Fuel Filter No. 503-44-32-01. This is a quality aftermarket Husqvarna fuel filter . It fits 3/16" fuel line and replaces OEM part numbers 503 44 32-01, 503443201, 503 44 32 01, 501-87-76-01, 501 87 76-01, 501877601, 501-87-76-02, 501 87 76-02, 501877602, 502-16-18-01, 502 16 18-01, and 502161801.