Air Filter for Briggs & Stratton 491588, 491588S, 494245 Brand New Aftermarket Air Filter Size:5-1/4"L x4-1/2"W x3/4"H Replace Briggs & Stratton 399959,491588,491588S Replace John Deere LG491588JD,PT15853 Replace Ariens 21529800, TORO 119-1909