About This Item For Brigg Stratton] For B&S Lawn Mower Air Filter Part No. 491588S 491588 4915885 399959 Part No. 4101 5043 5043A 5043D 5043H 5043K. For 3.5 to 6.5 hp engines, 625e 675ex 725ex 625- 675 series components. Fits lawn mower and tractor air filters of several brands]. It is a good replacement air filter for Al-Ko 470/520, PLM5121, Gutbrod, Wikinger, Sabo, Gardol G553CME, Toro, Champion and Troy mower, Craftsman, Honda, Husqvarna, Yardman, lawn boss etc. Other Compatible Models] Mower/Tractor Air Filter: Fits John Deere #JD-pt15853 lg491588, Stens 102-549, Oregon 30-710 30-927, Rotary 2838, Ariens 21529800, Champion 100263 Air filter, replaces the original filter. . High Quality PartsThe filter paper has a filtration efficiency of 99.5%, protected by a wire mesh on the back, and the whole part is surrounded by a foam rubber frame to reduce noise. OEM standard 491588S air filter. The dimensions are 13.2cm*11.2cm*2.3cm. It is OEM compliant, making it compact and easy to install.