Briggs stratton genuine air filter foam 450e, 500e, 550e 575ex series 799579for use with 300e, 450e, 500e, 550e, 575ex series engines.suitable for the following models300e seriesmasport 150stmountfieldhp185 299164623 sf 299164623 wxmountfield sp185 299264623 sf 299264623 wx450e seriesatco quattro 15 297411027 at7atco quattro 15s 297412027 at7atco liner 16 299434027 at4atco liner 16s 299439027 at4cobra m40spbcobra rm40spbhayter osprey 610ahayter spirit 41 616jhayter spirit 41 617jhayter spirit 41 619jmtd46bmtd 46bsmcculloch m40 125mcculloch m46 125mcculloch m46 125wrstiga multiclip 47sqb 298472828 s15stiga src550 rb 212501022 14webb supreme wer16hpwebb supreme wer16spwebb supreme wer18hpwebb supreme wer18spwebb elite we42sp500e seriesatco quattro 16 295441027 at4atco quattro 16s 295442027 at4cobra m46spbcobra mm51bcobra rm40spbcobra t40bmasport 350stmasport mulcher 18snapper nx 40snapper nx 50toro 20943webb supreme r18hwwebb elite rr16550e seriesal ko highline 473sp ak119464575ex seriesal ko highline 46.7 sp ak119809cobra rm46spbrhayter harrier 41 374asnapper nx 60if you are unsure whether this is the correct part for your machine, please fill out our parts enquiry form here. We will then respond to confirm whether or not it is the correct part for your machine.